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fandango49's avatar
fandango49
Explorer
Jun 17, 2015

12V house battery issue

Need help with a 12V issue.
Travel trailer's 12V battery is fully charged, electric jack works. No lights or 12v accessories inside unit work on 12V. When the cord is plugged into tow vehicle everything works and works when plugged into shore power only.
Found a junction were 12V from battery enters and joins up with the 12V
from tow vehicle, was a plastic connector that had broke in half that has terminals to connect the wires.
My question is this some type of diode or something? Is it OK if house battery, tow vehicle battery and on board converter are all tied
together with just a single connector?
  • lanerd's avatar
    lanerd
    Explorer II
    Jun 17, 2015
    FWIW, most electric jacks are connected directly to the battery with it's own fuse.

    I always thought that the breaker others are talking about was a large fuse.

    Ron
  • westend's avatar
    westend
    Explorer
    Jun 17, 2015
    That "junction/connector" may be what's left of an inline circuit breaker. Nearly all RV's have a circuit breaker close to the battery. This is to protect the battery cable and connected circuits from drawing full battery power in case of a short.
  • BFL13's avatar
    BFL13
    Explorer II
    Jun 17, 2015
    Your battery path to the fuse panel is open. Yes the various sources of 12v can use the same path. Here is a Komfort 5er's for example.

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