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BEagen's avatar
BEagen
Explorer
Sep 11, 2020

No 12v input from battery, 2004 Terry Trailer

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.

14 Replies

  • 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.
  • 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
  • My trailer fuse panel has a reverse polarity protection fuse.

    Did you double check you connected the 2 x 6v batts in series?
  • 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.