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Old 04-17-2019, 11:11 AM   #1
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Intermittant 12v power

Just returned from 2 day camping trip, everything worked fine. A day later went to clean up and there was no 12v power from the battery feed.


After checking with a multi-meter fuses were good, though no power at the fuse box inside.



I traced 12v from the batteries to the the relay(?) box under the frame and that is as far as I could go before the wiring heads underneath the liner.



The 12v power came back on a little while later without any tinkering other than checking with the multi.


The only thing I can think of is we drove home in light rain and may have gotten something wet near the relay.
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Old 04-17-2019, 04:03 PM   #2
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Quote:
Originally Posted by firsthere View Post
Just returned from 2 day camping trip, everything worked fine. A day later went to clean up and there was no 12v power from the battery feed.


After checking with a multi-meter fuses were good, though no power at the fuse box inside.



I traced 12v from the batteries to the the relay(?) box under the frame and that is as far as I could go before the wiring heads underneath the liner.



The 12v power came back on a little while later without any tinkering other than checking with the multi.


The only thing I can think of is we drove home in light rain and may have gotten something wet near the relay.
That relay box is actually a interior electrical junction box where your umbilical cord connects to the trailer wiring and really shouldn't be used for the purpose it is serving. When your going down the road in the rain that box is open to water intrusion. There should be 2 screws on opposite corners so you can open it and inspect the wires for loose/missing wire nuts, splices or wires shorting out to the bare metal of the box or each other.

If your handy with electrical wiring you can swap that box out for a water proof box. Remember to disconnect the trailer battery, the umbilical from your tow vehicle and disconnect from shore or generator power.
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Old 04-17-2019, 06:32 PM   #3
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I still had power after the non waterproof box so I'm thinking its the exposed circuit breaker junction. I read it has a reset though It was not reset when checking for voltage.



Coincidentally, this current topic may relate to this situation.


Rewiring power & breaker at trailer tongue - questions
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