House Batteries not being charged by engine.

[Nutinelse2do]

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 solenoid

Is 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 input

NutinElse2do

[Nutinelse2do]

The black module is a battery disconnect switch --

[enblethen]

I cannot read the description of the module mounted to the battery terminal. It could be the control for the battery charge.
Verify that the yellow wires are not or are going to this module.

[Nutinelse2do]

enblethen wrote:

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 only should have 12-volts DC.
.

The only time that the small terminal on top has 12v is when the battery boost button is engaged.

I do not see any fuses for the chassis blown they all have continuity, as well as all the fuses in the converter bay

Again, thanks for all the help, this is progress...

Richard

[pianotuna]

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.

[enblethen]

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.

[IB853347201]

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.

[SJ-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

[SJ-Chris]

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