I accindentally installed one of my two, 6v batteries backwards, creating a reverse polarity. Since then, the trailer's converter will not recognize 12 volt battery input. I read about the possibility of a separate, resettable breaker that is used to protect the converter in such a situation. I've looked high and low and cannot find one. I have a 2004, Fleetwood Terry 300BH trailer. The fan in the converter runs when plugged into A/C power, but won't recognize the (new) 12 volt house battery. Interesting, the 12v systems work when the trailer is plugged into the the tow vehicle. Any advice greatly appreciated.

I'm a bit confused on how ONE backwards creates reverse polarity. I would think that means you connected them in parallel instead of series, resulting in 6v, which is not recognized.If you come back, please post a wiring diagram.

My trailer fuse panel has a reverse polarity protection fuse.Did you double check you connected the 2 x 6v batts in series?

Converter should have 'reverse polarity' fuses.....depending on amp size of converter One or Two 30A fusesDepending on converter they could be on DC Dist Fuse Panel or on converterThey blow if battery cables are reversed and then NO 12VDC from battery to DC Fuses

2oldman: The two 6v were in series, but one was inadvertently reversed. I assume that created a reverse polarity situation. Sorry, I don't know how to post a diagram.carringb: Wiring diagram shows a 40 amp fuse between the battery and converter but I can't find it. Believe me, I have looked and looked...Old-Biscuit: I agree. But, cant find anything like that. No 30 amp fuses on the DC Dist Fuse Panel; just 15s and 20s. I need to find the in-line fuse/breaker somehow. Thanks for all your comments and insights.

BEagen wrote:2oldman: The two 6v were in series, but one was inadvertently reversed. I assume that created a reverse polarity situation. Sorry, I don't know how to post a diagram.carringb: Wiring diagram shows a 40 amp fuse between the battery and converter but I can't find it. Believe me, I have looked and looked...Old-Biscuit: I agree. But, cant find anything like that. No 30 amp fuses on the DC Dist Fuse Panel; just 15s and 20s. I need to find the in-line fuse/breaker somehow. Thanks for all your comments and insights.If you connected the batteries neg to negative and then connected the other two terminals to the trailer wiring, nothing would happen, power only flows in one direction. Where the main RED battery wire connects at the rear or front of the DC fuse panel, there has to be a fuse. The fuse boards come that way. Maybe someone stuck a 20 in there.

No 12v input from battery, 2004 Terry Trailer | Good Sam Community

14 Replies

BEagen
Explorer
Sep 11, 2020
2oldman: The two 6v were in series, but one was inadvertently reversed. I assume that created a reverse polarity situation. Sorry, I don't know how to post a diagram.
carringb: Wiring diagram shows a 40 amp fuse between the battery and converter but I can't find it. Believe me, I have looked and looked...
Old-Biscuit: I agree. But, cant find anything like that. No 30 amp fuses on the DC Dist Fuse Panel; just 15s and 20s.
I need to find the in-line fuse/breaker somehow. Thanks for all your comments and insights.
Old-Biscuit
Explorer III
Sep 11, 2020
Converter should have 'reverse polarity' fuses.....depending on amp size of converter One or Two 30A fuses
Depending on converter they could be on DC Dist Fuse Panel or on converter

They blow if battery cables are reversed and then NO 12VDC from battery to DC Fuses
carringb
Explorer
Sep 11, 2020
My trailer fuse panel has a reverse polarity protection fuse.

Did you double check you connected the 2 x 6v batts in series?
2oldman
Explorer II
Sep 11, 2020
I'm a bit confused on how ONE backwards creates reverse polarity. I would think that means you connected them in parallel instead of series, resulting in 6v, which is not recognized.

If you come back, please post a wiring diagram.

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No 12v input from battery, 2004 Terry Trailer

14 Replies

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