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Your Revel's charging system, for your van only

Pick your Revel. Everything below narrows to what applies to it: what Winnebago changed, what to check, and your options, starting with the free ones.

Which Revel do you have?

Tell them apart in minutes

Model year alone can mislead. Winnebago's own records split the lithium generations by build date, on May 17, 2022, so a 2022 Revel can be either kind.

  • Open your battery app. Xantrex means the earlier system. Lithionics means the Balmar system. An EcoFlow screen means a 2025+ van.
  • Look at the second alternator. A Balmar label, with an MC-618 regulator that has a small digital display, means the Balmar system.
  • Check the engine. The V6 badge means 3.0 L. The 2024 Revel uses the 2.0 L engine. Your VIN's tenth character gives the chassis year.
The one-line answer for each Revel
Your RevelIn one line
2018–2020AGM vans have no factory second alternator. Lithium 2020 vans are in the free cable recall, and may already have one.
Xantrex batteries · 3.0 LWinnebago's recall work was cable work only. Output was not changed.
Lithionics + Balmar · 3.0 LWinnebago acted with a regulator swap, an output reduction, and a retrofit bulletin.
2024 Revel · 2.0 LThe same Balmar actions, with parts for the 2.0 L engine.
2025+ Revel SportMore than one power setup shipped. Which one you have decides the rest.
2025+ RevelA separate high-voltage system. None of the older actions apply.
Sources

2018–2020

Lithium vans only · we confirm fit first

AGM vans left the factory without a second alternator, so there is no Winnebago charging campaign to check. Lithium 2020 vans are the ones to verify first.

  • AGM vans have three AGM house batteries and no factory second alternator.
  • We add one only to vans with a lithium house battery. If yours still has the factory AGM batteries, the battery upgrade comes first.
  • Lithium vans built from December 20, 2019 are in recall 23V-663. Winnebago says it is free to owners regardless of mileage, age of vehicle, or ownership, from this time forward.
  • Lithium 2020 vans may already have a second alternator, so we check yours before planning an add-on.
  • On a lithium 2020 van we also check the Mercedes data card before ordering: factory second-alternator prep was an option on that chassis, and it changes the parts.

What Winnebago did to vans like yours

  • Recall 23V-663: battery cables rerouted and securedLithium vans · free
  • Campaign 75-08: output reductionDoes not apply
  • Bulletin 7SB002-26-01A: Nations retrofitDoes not apply
Why is this different on early vans?

Adding charging to a van without a second alternator means adding the alternator, a bracket and a regulator. It is a different job from replacing one.

Where does this come from?

ODB's own records and Winnebago's recall report.

See the kit for your vanAsk us about your van

Xantrex batteries · 3.0 L

The ODB kit fits

Winnebago's recall work on these vans was cable work only. The charging system itself was not changed, and the output campaign does not apply.

  • Winnebago's documents call the factory second alternator a Xantrex alternator.
  • Recall 23V-663 rerouted and secured the cables and checked the alternator cables under the van. Winnebago says it is free to owners regardless of mileage, age of vehicle, or ownership, from this time forward.
  • Recall 20V-474 covered 2021 Revels built 2020-06-01 to 2020-07-31: an auxiliary alternator belt that can wear and come off, taking the engine serpentine belt with it.

What Winnebago did to vans like yours

  • Recall 23V-663: cable rework, no regulator changeFree
  • Recall 20V-474: auxiliary alternator belt alignmentEarly 2021 builds only
  • Campaign 75-08: output reductionDoes not apply
  • Bulletin 7SB002-26-01A: Nations retrofitDoes not apply
What should I watch for?
  • On the belt recall, Winnebago says a loose belt makes a flapping sound before it comes off.
  • RoamRig reports the positive alternator cable rubbing through on the frame and shorting. Winnebago's recall inspects that same cable run.
Where does this come from?

Winnebago's recall reports and remedy instructions, and RoamRig's installer notes.

What do technicians need?

Belt for the 3.0 L with the Nations kit: Gates K060523HD.

Configure for your vanAsk us about your van

Lithionics + Balmar · 3.0 L

The ODB kit fits

Winnebago has acted on this system with a recall that replaced the regulator, a campaign that turned output down, and a bulletin that offers a Nations alternator.

  • Recall 23V-663 replaces the Balmar MC-618-WB regulator with an MC-618-WB3, and adds a breaker control harness. Winnebago says it is free to owners regardless of mileage, age of vehicle, or ownership, from this time forward.
  • Campaign 75-08 set the regulator's maximum field to F-9. Winnebago says charging takes approximately 30–35% longer on a typical drive, most noticeable right after a cold start and less so as the alternator warms up. It adds that shore power and solar charging are unaffected.
  • Bulletin 7SB002-26-01A offers a Nations alternator kit. Winnebago reimburses the dealer for the kit only, with no labor, and freight for the retrofit kit is not reimbursed, so ask your dealer what you would pay. Claims are due by December 31, 2026.

What Winnebago did to vans like yours

  • Recall 23V-663: cables, new regulator, breaker control harnessFree
  • Campaign 75-08: maximum field set to F-9Closed November 30, 2025
  • Bulletin 7SB002-26-01A: Nations alternator, kit onlyClaims by December 31, 2026
Why did Winnebago turn the output down?
  • Winnebago says the Balmar MC-618 maximum field setting generated excessive heat, reducing reliability and charging efficiency.
  • Balmar defines F-9 as 55% of full field (a 45% field reduction), and notes that a field reduction does not translate one-to-one into less alternator output, so nobody has published how many amps the change costs.
  • Winnebago's later bulletin cites higher-than-normal alternator failure rates on Revel and Ekko vans with Balmar alternators.
Where does this come from?

Winnebago's remedy instructions, campaign notice and retrofit bulletin, and Balmar's regulator manual.

What do technicians need?
  • Recall 23V-663 adds a breaker control harness with a circuit wired to the Balmar regulator. An ODB conversion replaces that regulator, so we confirm how the recall wiring is handled before quoting a remedied van.
  • Belt for the 3.0 L with the Nations kit: Gates K060523HD.
Configure for your vanAsk us about your van

2024 Revel · 2.0 L

The ODB kit fits, with 2.0 L parts

The same Balmar system and the same Winnebago actions as the V6 vans, with parts for the 2.0 L engine.

  • Winnebago lists the 2024 Revel's engine as AWD 2.0 L four-cylinder turbo-diesel. Check your engine badge: fit follows the engine, not the model year.
  • Campaign 75-08 covered certain 2022–2024 Revels and 2025 Revel Sports. Recall 23V-663 covers vans built through September 25, 2023.
  • The retrofit bulletin has a separate Nations kit, with a Mercedes-Benz belt, for Revels with the 2.0 L four-cylinder.

What Winnebago did to vans like yours

  • Recall 23V-663: cables, new regulator, breaker control harnessIf built by September 25, 2023
  • Campaign 75-08: maximum field set to F-9Closed November 30, 2025
  • Bulletin 7SB002-26-01A: Nations 2.0 L kit, kit onlyClaims by December 31, 2026
Why did Winnebago turn the output down?
  • Winnebago says the Balmar MC-618 maximum field setting generated excessive heat, reducing reliability and charging efficiency.
  • Balmar defines F-9 as 55% of full field (a 45% field reduction), and notes that a field reduction does not translate one-to-one into less alternator output, so nobody has published how many amps the change costs.
  • Winnebago's later bulletin cites higher-than-normal alternator failure rates on Revel and Ekko vans with Balmar alternators.
Where does this come from?

Winnebago's model specifications, recall report and retrofit bulletin.

What do technicians need?

Belt for the 2.0 L with the Nations kit: Mercedes-Benz A0009935800.

Configure for your vanAsk us about your van

2025+ Revel Sport

Tell us which setup you have

Winnebago shipped more than one power setup. Which one you have decides everything else.

  • Winnebago Power Standard uses a 5 kWh EcoFlow battery with an alternator charger in the Power Hub.
  • Campaign 75-08 adjusted the Balmar regulator and covered certain 2022–2024 Revels and 2025 Revel Sports, so it applies only to a Sport with the Balmar setup, not the EcoFlow one.
Which setups shipped?

A dealer listing (RVUSA) describes another setup: a 4.1 kWh Lithionics battery with a second alternator. Setups may vary, so check your van's battery screen and tell us which one you have.

Where does this come from?

Winnebago's model specifications and campaign notice, and an RVUSA dealer listing.

Ask us about your van

2025+ Revel

A different system

This van has a 48 V high-output second alternator on its own system. None of the older Winnebago actions apply.

  • Winnebago's power system here is the Winnebago Power MAX system: an 8.4 kWh Lithionics lithium battery with dual alternator charging and an EcoFlow Power Hub Pro.
  • Campaign 74-09 disconnects the AC sense plug to prevent unintended activation of the 12 V system. Campaign 75-01 is an EcoFlow firmware update the owner can do or have a dealer do.
  • Bulletin 7SB007-24-01A: early EcoFlow Power Hub Pro firmware does not charge the house battery from shore power at very low charge; driving or idling recharges it.
Is there anything I shouldn't do?

Winnebago's manual warns that shutting off the lithium batteries or the circuit breaker with the engine running can cause component malfunction. The second alternator has an APS regulator for the lithium-battery alternator.

Where does this come from?

Winnebago's model specifications, operator manual, campaigns and service bulletin.

Ask us about your van

Before you spend anything: is it the alternator?

A few quick checks rule out the simple causes first.

Give it a moment after starting. Winnebago says the second alternator can take up to 2 minutes to begin charging.

Read your battery app while driving. A battery near full takes little charge, so check at a lower charge level.

A whine from the second alternator, or a house battery that drains when it shouldn't, on a Balmar-equipped van? Winnebago's instruction is to disconnect the regulator’s 4-pin connector and contact Winnebago.

Warm or discolored connections deserve a look before anything else. Winnebago's recall includes an under-van check that the alternator power and ground cables are secured and not chafed.

How long does charging take to start?

Give it a few minutes after starting. RoamRig says charging may start about 200 seconds after the engine starts.

Sources

Your options, cheapest first

  1. Leave it

    If it charges enough for how you travel, you may not need anything. Keep an eye on your app readings.

  2. Free Winnebago work

    Ask a Winnebago dealer to confirm recall 23V-663 on your VIN. Winnebago says it is free to owners regardless of mileage, age of vehicle, or ownership, from this time forward.

  3. Winnebago's retrofit bulletin

    On Balmar vans, until December 31, 2026, the retrofit bulletin reimburses the dealer for the kit only, with no labor, and freight for the retrofit kit is not reimbursed. Ask your dealer what you would pay.

  4. Service what you have

    Belt, tensioner and cable condition matter on any setup. We can inspect them during another visit.

  5. Upgrade with ODB

    A Nations 280 A alternator with a Wakespeed WS500 regulator. The WS500 regulates toward a target alternator temperature instead of reacting after it overheats, monitors battery temperature to protect the battery from over- and under-temperature, and works with several battery management system brands over CAN, using RV-C and OSEnergy protocols. Nations backs the alternator with a 2-year replacement warranty.

Sources

Take this to your Winnebago dealer

  • Recall 23V-663 (Winnebago 178)Battery cable rework. On Balmar vans it also replaces the Balmar MC-618-WB regulator with an MC-618-WB3 and adds a breaker control harness.
  • Recall 20V-474 (Winnebago 162)Auxiliary alternator belt, 2021 Revels built 2020-06-01 to 2020-07-31: an inspection and pulley alignment, with a new belt if the old one is damaged.
  • Campaign 75-08Balmar-equipped vans only. Maximum field set to F-9. Closed November 30, 2025.
  • Bulletin 7SB002-26-01ABalmar-equipped vans only. Nations retrofit kit, with the kit reimbursed to the dealer. Claims by December 31, 2026.
  • Campaigns 74-09 and 75-01AC sense plug disconnect, and the EcoFlow firmware update.
  • AskWhich of these show as done on my VIN?
Sources

Coming from out of state?

Most of our customers travel to our Arvada shop. All work is done there, by appointment.

  • Have any open Winnebago recall done at a dealer near home first. Its wiring touches the same system we work on.
  • Plan other upgrades for the same visit so one trip covers them.
  • Send us your VIN, a photo of your battery label or app, and your engine badge. We confirm fit before you book travel.
Ask us about your van

Recall, campaign and bulletin, untangled

Owners often lump Winnebago's recalls, service campaign, and dealer bulletin together. The recalls cover cables and a drive belt; none of them replaces the alternator itself.

Safety recall

The recall

NHTSA recall 23V-663 (Winnebago recall 178) covers certain 2020–2024 Revels with a lithium house power system. It addresses cables near the lithium batteries that can contact the battery hold-down brackets and short.

On vans with a Balmar alternator, the recall work also replaces the Balmar MC-618-WB regulator with an MC-618-WB3 and adds a breaker control harness with a circuit wired to the Balmar regulator.

Winnebago's dealer notice says the recall work is free to owners regardless of mileage, age of vehicle, or ownership, from this time forward. Check your VIN with a Winnebago dealer to see whether it has been done.

Service campaign

The output campaign

Winnebago's Field Service Campaign 75-08 covered certain 2022–2024 Revels and 2025 Revel Sports. On vans with a Balmar alternator, the dealer set the Balmar MC-618 regulator's maximum field to F-9, turning the second alternator's output down so it is not overloaded.

Winnebago's notice to owners says battery charging can take approximately 30–35% longer on a typical drive, and that the change is most noticeable right after a cold start and less so as the alternator warms up.

It adds that shore power and solar charging are unaffected. If your alternator still charges at full strength right after a cold start, the campaign may not have been done; ask your dealer to check.

The campaign is closed: Winnebago offered it until November 30, 2025. Ask your dealer what applies now.

Dealer bulletin

The retrofit bulletin

Winnebago's dealer bulletin 7SB002-26-01A, issued February 19, 2026, cites higher-than-normal alternator failure rates.

It describes a Nations replacement alternator kit supplied without a regulator or harness, with kits for 3.0 L six-cylinder and 2.0 L four-cylinder Mercedes engines.

On requested retrofits, Winnebago reimburses the dealer for the kit only, with no labor, and dealer claims close December 31, 2026. If your Balmar has already failed, the bulletin sends it through the standard warranty process instead. Ask your dealer whether your van qualifies and what you would pay.

Additional model notes

Winnebago says a loose belt makes a flapping sound before it comes off. If you hear it, have the belt checked, and ask a Winnebago dealer whether the recall was done on your VIN.

It has a 48 V high-output second alternator and an APS regulator for the lithium-battery alternator, so the Winnebago recalls, campaign and bulletin covered below do not apply to it.

Winnebago's dealer notice says the recall work is free to owners regardless of mileage, age of vehicle, or ownership, from this time forward. Check your VIN with a Winnebago dealer to see whether it has been done.

Symptoms and what to check

Charging stops when it is hot, or after running the A/C and then driving

An alternator temperature limit, a battery temperature sensor reading a hot terminal, or the battery's own temperature limit.

Balmar's regulator kits include two temperature sensors, and some setups mount one on the battery. If yours sits on a battery terminal, a loose or corroded terminal can heat up and read as a hot battery.

Voltage drop between the battery and the inverter

Resistance in the cables or connections, which also makes heat. Measure at both ends while the inverter carries a load and compare.

No alternator charging at all

Check the fuse, the belt, and the alternator's positive cable for chafe before replacing parts.

Slower charging since a dealer visit

On a Balmar-equipped van, the output campaign may have turned your alternator down.

A whining second alternator, or a house battery that drains unexpectedly, on a Balmar-equipped van

Winnebago's campaign notice says to disconnect the regulator’s 4-pin connector and contact Winnebago.

Belt squeal or chirp under load

The belt or tensioner may be worn or overloaded.

Where charging problems start

The lettered spots match the notes below the drawing.

How the Revel second-alternator system connects, and where problems startThe engine drives the second alternator by a belt in the engine bay. A charging cable runs to the house battery inside the van, and the battery feeds the inverter. The regulator, with temperature sensors at the alternator and the battery, controls the charge. Lettered spots match the notes below the drawing. ENGINE BAY INSIDE THE VAN Enginecrank pulley Secondalternator charging cable Regulator Housebattery Inverter ABCD
How the Revel second-alternator system connects, and where problems startThe engine drives the second alternator by a belt in the engine bay. A charging cable runs to the house battery inside the van, and the battery feeds the inverter. The regulator, with temperature sensors at the alternator and the battery, controls the charge. Lettered spots match the notes below the drawing. ENGINE BAY INSIDE THE VAN Enginecrank pulley Secondalternator charging cable Regulator Housebattery Inverter ABCD
  1. Heat builds at the alternator. The regulator’s temperature limit cuts output to protect it.
  2. A loose or corroded battery terminal gets hot. A temperature sensor on that terminal can read it as a hot battery.
  3. Resistance between the battery and the inverter shows up as voltage drop at the inverter.
  4. More output means more belt load. Check the belt and the tensioner.

Temperature sensor

Detailed system comparison

Leave it

Do nothing if your charging keeps up with how you use the van. Not every Revel needs more alternator.

Service what you have

Service first if you see heat or voltage-drop symptoms: connections, cables, sensors, fuse, and belt.

Dealer retrofit

Ask your Winnebago dealer about the Nations retrofit if your van has a Balmar alternator. It replaces the alternator and keeps the factory regulator and harness.

ODB upgrade

ODB's Nations 280XP and Wakespeed WS500 system adds charging capacity, with a regulator that manages alternator temperature and reads your battery.

Wakespeed says the WS500 regulates toward a target alternator temperature instead of reacting after it overheats and monitors battery temperature to protect the battery from over- and under-temperature.

We configure the regulator to your battery bank, quote a heavy-duty belt with the install, and check the connections the charging current depends on.

How the options compare

The first column is the factory Balmar setup. Vans built before May 17, 2022 left the factory with a Xantrex alternator instead; see the 2021–2022 Xantrex Revel section above.

Alternator

  • Factory Balmar, as builtBalmar XT-170
  • Winnebago dealer retrofitNations replacement alternator
  • ODB Nations 280XP + WS500Nations 280XP

Rated output

  • Factory Balmar, as built170 A
  • Winnebago dealer retrofitNot published
  • ODB Nations 280XP + WS500280 A

At idle

  • Factory Balmar, as builtup to 128 A
  • Winnebago dealer retrofitNot published
  • ODB Nations 280XP + WS500ODB measurement pending

Regulator

  • Factory Balmar, as builtFactory Balmar regulator
  • Winnebago dealer retrofitFactory regulator and harness kept
  • ODB Nations 280XP + WS500Wakespeed WS500, set up for your battery

Heat management

  • Factory Balmar, as builtFactory temperature limit
  • Winnebago dealer retrofitFactory regulator’s limit
  • ODB Nations 280XP + WS500regulates toward a target alternator temperature instead of reacting after it overheats

Battery temperature

  • Factory Balmar, as builtPer factory setup
  • Winnebago dealer retrofitPer factory setup
  • ODB Nations 280XP + WS500monitors battery temperature to protect the battery from over- and under-temperature

Talks to the battery

  • Factory Balmar, as built—
  • Winnebago dealer retrofit—
  • ODB Nations 280XP + WS500works with several battery management system brands over CAN, using RV-C and OSEnergy protocols

Parts coverage

  • Factory Balmar, as built—
  • Winnebago dealer retrofitWinnebago reimburses the dealer for the kit only, with no labor; dealer claims close December 31, 2026
  • ODB Nations 280XP + WS500Nations 2-year replacement warranty

Labor

  • Factory Balmar, as built—
  • Winnebago dealer retrofitNot reimbursed by Winnebago
  • ODB Nations 280XP + WS500Quoted by ODB with the install
Nations 280XP installed as the Revel's second alternator, engine bay view
A Nations 280XP installed by ODB.
Wakespeed WS500 regulator mounted with its harness
The Wakespeed WS500 regulator, mounted and wired.

Identify the hardware

Xantrex Freedom X control panel in an early lithium Revel
A Xantrex panel like this points to the early lithium system.

Questions owners ask

Why does my second alternator stop charging when it's hot, or after I run the A/C?

Often a temperature limit is doing its job: the alternator, the battery sensor, or the battery itself is saying stop. A hot or high-resistance battery terminal can make a battery sensor read a hot battery when the battery is fine. An alternator that was replaced and charges well when cold can still do this. Ask what it was replaced with, check the connections, and measure hot output before buying parts.

Is there a recall on the Revel's Balmar alternator?

No. NHTSA recall 23V-663 addresses cables near the lithium batteries that can contact the battery hold-down brackets and short. On Balmar vans, the recall work also replaces the Balmar MC-618-WB regulator with an MC-618-WB3. Winnebago's alternator output campaign and replacement bulletin are separate from the recall.

Did Winnebago's campaign reduce my charging, and by how much?

On Balmar-equipped vans, campaign 75-08 set the regulator's maximum field to F-9, turning the alternator's output down so it is not overloaded. Winnebago says battery charging can take approximately 30–35% longer on a typical drive, and that shore power and solar charging are unaffected. Measure your own output hot and cold to know what your van does now.

How do I check which recall, campaign, or bulletin applies to my VIN, and should I finish it first?

Give your Winnebago dealer your VIN and ask for open recalls, completed campaigns, and whether the Nations retrofit bulletin applies. Complete open safety recalls before an upgrade. Tell us what was done so we configure the system around it.

How does Winnebago's Nations retrofit differ from ODB's system?

Winnebago's bulletin describes a Nations replacement alternator kit supplied without a regulator or harness; Winnebago reimburses the dealer for the kit only, with no labor. ODB's system pairs the Nations 280XP with a Wakespeed WS500 regulator configured to your battery. Ask your dealer about eligibility and cost, then compare.

Can a loose or corroded battery terminal cause charging problems?

Yes. Resistance at a terminal causes voltage drop and heat, and heat can trip temperature protection. If you also see voltage drop between the battery and inverter, check and correct the connections before replacing parts.

What will the Nations 280XP and Wakespeed WS500 put out?

Nations rates the 280XP at 280 A. Real output depends on engine speed, heat, and how the regulator is configured. We plan to add measured idle and highway numbers once we have enough controlled readings across vans.

Will a bigger alternator overload my battery, BMS, or wiring?

Regulator configuration plus correct cable and fuse sizing is what prevents that. The WS500 also monitors battery temperature to protect the battery from over- and under-temperature. We size the output to the battery, cables, and fuse, not to the alternator's maximum.

Does it work with Xantrex, Lithionics, or aftermarket batteries?

We configure it to the battery you have. The WS500 works with several battery management system brands over CAN, using RV-C and OSEnergy protocols; if your battery cannot communicate, it relies on its own voltage and temperature sensing.

Why replace the belt, and sometimes the tensioner?

A higher-output alternator puts more load on the belt drive. We quote a heavy-duty belt with the install. On 2021–2023 Revels with the 3.0 L V6, we also highly recommend replacing the accessory belt tensioner at the same time; it isn't required.

Which Revels does the ODB kit fit?

The kit replaces the factory second alternator on 2021–2023 Revels with the 3.0 L V6, and adds one to the 2018–2020 Revel with a lithium house battery. It also fits 2024 Revels on the 2.0 L four-cylinder turbo-diesel. 2025+ Revel and 2025+ Revel Sport: this upgrade isn't offered; contact us to talk through options.

My early Revel has no second alternator. What are my options?

ODB adds one with a Nations kit: a mounting bracket, the 280XP alternator and the Wakespeed WS500 regulator, sized together with the wiring and belt drive. It is offered for vans with a lithium house battery.

Sources