We put new batteries on our travel trailer and now can't seem to get any power. Power works when the trailer is set up to the generator or house power. But otherwise none at all, and the refrigerator won't even turn to the propane. My husband said he checked and there's 12v coming off the batteries. But he's at a loss of why they aren't running the trailer.

DID the batteries get connect backwards..........Converter has Reverse Polarity FUSES (30A or larger on front or back of converter) that blow when battery cables are reversed.Trace cables from battery NEG post to trailer frame.Also Trace positive cable from battery to where it goes inside trailer. They should be an IN-LINE FUSE on positive cable under trailer tongue that could be blown (could be a DC circuit breaker ----small box with 2 studs vs the in-line fuse, could be tripped---look for small reset button on side of it) Last but not least.....battery disconnect switch OFF

Likely batteries have been installed in reverse polarity. Probably blew the fuses on the back of the converter or blew the converter out completely. The control board for the fridge requires 12V to operate properly. Potentially damaged this control board as well although unlikely. RV wires are not colored the way that auto batteries are. Good Luck!Mike

Check that circuit breaker near the tongue or front frame. It may also be inside a junction box. Some have a small button to reset the breaker.

Yep, probably reversed the battery wires, which happens a lot.either blew the reverse polarity fuse or tripped the resettable breaker, tucked up under the trailer's A-frame. just push the little black button to reset.

Moved from General RV'ing forum.

New Batteries and No Power | Good Sam Community

Mike_LeClair
Explorer
Oct 17, 2015
Likely batteries have been installed in reverse polarity. Probably blew the fuses on the back of the converter or blew the converter out completely. The control board for the fridge requires 12V to operate properly. Potentially damaged this control board as well although unlikely. RV wires are not colored the way that auto batteries are.

Good Luck!

Mike
Old-Biscuit
Explorer III
Oct 17, 2015
DID the batteries get connect backwards..........

Converter has Reverse Polarity FUSES (30A or larger on front or back of converter) that blow when battery cables are reversed.

Trace cables from battery NEG post to trailer frame.

Also Trace positive cable from battery to where it goes inside trailer.
They should be an IN-LINE FUSE on positive cable under trailer tongue that could be blown (could be a DC circuit breaker ----small box with 2 studs vs the in-line fuse, could be tripped---look for small reset button on side of it)

Last but not least.....battery disconnect switch OFF

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