HELP! Battery not supplying electricity to RV!

Why do we just "assume" that a person w/ a battery connection problem would have at least checked the battery terminals for corrosion before even thinking about posting the question ?? If they refuse to get their hands dirty, and don't know a CB from a bettery disconnect, and are going to take it to RV repair anyway, why ask ?

Turns out that my connectors were corroded AND the cut off switch was in the wrong position from what the rv dealership said it should be upon installation. But that would be secondary to the corrosion issue. The repairman did point our where the item you listed above was located. ..not under frame thank goodness. All is well!

Ok so go find the circuit breaker ..from the picture.. And jumper the wire from one terminal to the other

either its bad, or somebody forgot a wire when reconnecting every thing

My lack of terminology is the issue. Sorry about that. Yes, they applied an external cut off switch. There is the up position then to the left is 1 and to the right is 2. It's a marine switch, I believe they said. We tried all positions to no avail.

i think you are confused about the whole issue

a breaker has NOTHING to do with whether the battery can be run down or not
it is a short circuit safety and it came pre-installed from the factory

IF the RV service shop did anything to help you stop battery run down in storage
they would have added a disconnect switch someplace

maybe it is Not turned on

Great info. I had my rv dealer install an external breaker so that it would not run my battery down so fast when stored. All that you've said makes sense. I think they screwed up in the install. Until today, I always had it hooked up to the car or a campsite electric. i would've been SOL if I had chosen a city park...grrr.

I did get it to an rv campground that has a recommendation for an onsite RV repairman. I think I am going to give him a call. This doesn't sound so difficult, but electronics are not my thing. Yet now, I will have a much better understanding of what is most likely going on.

DC circuit breaker




And if that isn't the problem......do you have a 'battery disconnect switch' turned OFF?

And if battery was ever hooked up backwards there are 'Reverse Polarity' Fuse(s) on converter that will blow

Any 1 of the 3 will not allow battery to supply trailer with DC power


Do you have a power tongue jack?
Does it work when trailer is not plugged into the Yukon?

sounds like the 12v DC auto reset breaker between the battery and the TT wiring is bad

follow the black wire from the tt battery, it should go to a little silver box with (2) connections on it , just so you know ..the Black wire is the Positive/plus and the white is the Negative/ground..do not hook up battery backwards
goto the auto parts store and get a NEW One size 40 amps
as a test you can move one wire from one terminal onto the other terminal , if the thermal breaker is bad and everything else is OK power will come back on

Just because the coach battery is new, doesn't mean it has an adequate charge. check the battery @ the terminals with a volt meter.