Greetings all,Been RV'ing for 30 years and we just bought a 2019 Minnie Winnie 22r on a Ford E350 chassis.My house batteries are not getting a charge when engine running.Batteries charge with Genny, and shore power.I have read on all the different types of setup BIMs etc but none seem to fit what I have.In the picture link below I have 14.4 V on the left side of the boost solenoidIs it possible they made this RV with no charging to the house batteries from the engine?What am I missing? Thanks for you time and inputNutinElse2do

Can you crawl underneath and trace any red battery cable running back towards the chassis?With everything off (no generator or shore power), measure the voltage on your chassis. Then measure your voltage on your house batteries. They (in your case) should be different. Then measure the voltage on some of those wires to the left of your house batteries. and see which ones match your house battery voltage and which match your chassis voltage. This will tell you if you have a chassis fed battery cable back in your house battery location (...a clue at least).You can also do these measurements/tests with the engine on. Your chassis battery will likely be somewhere between 13.5-14.3v. Then you can probe those battery cable wires near your house batteries and see if you find a matching voltage. At least this way, you will know if you have your chassis 12v cable in the area near your coach batteries. Then you can probably identify the solenoid that is supposed to charge your house batteries while driving.Good luck!Chris

I suspect (and after re-reading I think you also mentioned) that the cylindrical item in the lower left is your solenoid for charging your house batteries while driving. Those do go bad pretty regularly (I've changed a few). Good news is they are inexpensive and that looks like a very easy location to swap it out for a new one.-Chris

Could be that the previous owner changed out the batteries and when reconnecting hooked up something incorrectly?anyhow, go to the winnebago.com, click on Owners, under resources click on Guides and Diagrams, under Plumbing and Wiring Diagrams click on Wiring Diagrams, click on your year and make and double check your batteries connections against the manufacturers spec.

The relay on the left battery is energized to charge house battery and to act as a booster in the event chassis battery fails.Start the rig and let it run for a few minutes. Check across the small terminals for 12-volts DC. If not present it could be a blown fuse in the battery control center. OOPS! the small terminal with engine running should have 12-volts DC.check from small terminal to a good negative (battery terminal) There should be low resistance.With engine off, check voltages on the large terminals, compare them. One should be chassis battery and the other should be coach.Relays should be continuous duty and not starter relays.Some are controlled by a switch on the dash.

Because I had a large battery bank (875 amp-hours) I blew the fuse 3 times on the engine charging system for house bank. I replaced the fuse with an autoreset circuit breaker. All remains well.You may wish to consider moving to a dc to DC charger. I love mine.

House Batteries not being charged by engine. | Good Sam Community

enblethen
Nomad
Dec 19, 2022
Glad to be of some help!
Hope other issues can be readily resolved.
Many problems on used rigs can go back to previous owners.
Nutinelse2do
Explorer
Dec 19, 2022
larry cad wrote:
Man am I disappointed. I thought this would last until the New Year and give me some entertainment.

Sorry to disappoint you so close to the holidays but the fuse FIXED the primary issue of batteries not changing --

Seems the previous owner removed the fuse in order to get the chime to stop for the jacks down, when they are in fact in the up position. Should be as simple as a switch on the jacks themselves. Time to chase down another little issue.

Bud ( enblethen ) if it wasn't for you and the diagram and you pointing out the jacks and the boost solenoid where on the same circuit I would still be chasing this issue. Thank you so very much for your help, wisdom, and kindness helping me with this issue.
larry_cad
Explorer II
Dec 19, 2022
Man am I disappointed. I thought this would last until the New Year and give me some entertainment.
Nutinelse2do
Explorer
Dec 19, 2022
So started headed under the dash where the stabilizer down light is and found the yellow wires that are part of the circuit. Low and behold I found this with no fuse in it. uggghh

I don't have a 5 amp fuse so have to run to the store and get some fuses.

Hopefully this will solve the issue and not create a ton of other issues, will report back as soon as I have the results

-Richard
enblethen
Nomad
Dec 19, 2022
Connection goes through the boost switch as shown on first page.
Nutinelse2do
Explorer
Dec 19, 2022
enblethen wrote:
Found what I didn't find yesterday.
Wiring diagram
First three pages shows wiring for boost and charging relay. Several connectors. My first thought is the one behind the boost switch is not fully connected.
Does the leveling jacks indicator and chime work? Looking at third page lower left corner.

Thanks for the diagram that may help. I have electric stabilizers on the rear only and a light on the dash to show they are still down and I just validated the jacks work but no light o n the dash or any tone.

-Richard
enblethen
Nomad
Dec 19, 2022
I didn't find anything that shows battery charge circuit other than through the boost switch.
enblethen
Nomad
Dec 19, 2022
Found what I didn't find yesterday.
Wiring diagram
First three pages shows wiring for boost and charging relay. Several connectors. My first thought is the one behind the boost switch is not fully connected.
Does the leveling jacks indicator and chime work? Looking at third page lower left corner.
Nutinelse2do
Explorer
Dec 19, 2022
CloudDriver wrote:

The yellow wire gets 12V when the ignition switch is on. With the engine running you should get 12V or higher at that terminal and chassis battery/alternator voltage at one of the heavy wire terminals. The other heavy wire terminal connects to the house batteries. If the solenoid is working properly the voltage should be the same on both sides. If no voltage at the yellow wire terminal when the ignition is on then some wire tracing is in order.

The only time the yellow wire gets 12v is when the boost switch is engaged. whether or not the ignitions switch is on or not.

-Richard
CloudDriver
Explorer
Dec 18, 2022
We have a 2003 Minnie. The relay that connects the chassis battery and alternator to the house batteries is the silver cylindrical one in your picture. Winnebago calls it the "Battery Mode Solenoid". I have replaced ours three times since we bought the MH new. After the third failure I bought this heavy duty contactor. No more issues.

The yellow wire gets 12V when the ignition switch is on. With the engine running you should get 12V or higher at that terminal and chassis battery/alternator voltage at one of the heavy wire terminals. The other heavy wire terminal connects to the house batteries. If the solenoid is working properly the voltage should be the same on both sides. If no voltage at the yellow wire terminal when the ignition is on then some wire tracing is in order.