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Old 04-03-2015, 03:47 AM   #21
Raz
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Who wired the tow vehicle?
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Old 04-03-2015, 03:56 AM   #22
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That was from the factory. 2012 4Runner. The brake controller was a simple plug in.
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Old 04-03-2015, 04:14 AM   #23
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No need to look for a breaker. It will be there. Factory wiring makes the tow vehicle less of a suspect. I doubt it's start up current either. Most factory wired vehicles have a relay to isolate until the tow is running. The trailer umbilical is where I would look next. That is, after you check the battery. Do let us know when you find the problem. Raz
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Old 04-03-2015, 04:18 AM   #24
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Will do. Thanks for your input!
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Old 04-03-2015, 06:40 AM   #25
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Check the polarity of the cables to the trailer battery. If they are reversed it will blow the fuse when you hook it to the tug.
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Old 04-03-2015, 08:49 AM   #26
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Check the polarity of the cables to the trailer battery. If they are reversed it will blow the fuse when you hook it to the tug.
Yup. If the umbilical is wrong, the fuse goes. If the battery is wrong, not only will the fuse go but all the fans will turn backwards too. Either way the battery sees a short when you plug in. Raz
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Old 04-03-2015, 02:50 PM   #27
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If that is the problem, at least it would be an easy fix! Of course I could never show my face again from embarrassment!! :P
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Old 04-03-2015, 03:01 PM   #28
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If it makes you feel any better, guess how I came up with that as a possible solution...
Oh crap now I can't show my face.
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Old 04-03-2015, 04:12 PM   #29
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You did say the previous owner did some creative wiring. Right? Raz
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Old 04-09-2015, 10:07 PM   #30
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Well the battery checks as OK so that isn't the problem. Not sure what to do now as that was the easy fix.
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Old 04-10-2015, 12:04 AM   #31
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If that is the problem, at least it would be an easy fix! Of course I could never show my face again from embarrassment!! :P
Trust me you would be surprised how often its the issue - especially on Scamps which are not as some think they should be - Positive to Black and Negative to White.
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Old 04-10-2015, 03:24 AM   #32
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Well the battery checks as OK so that isn't the problem. Not sure what to do now as that was the easy fix.
Did you make sure the polarity is correct from the trailer 7 pin to the battery? Raz
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Old 04-10-2015, 03:26 AM   #33
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No haven't even de-winterized yet. Just had the batteries in my basement so they didn't freeze over winter. And I thought black was always negative? So might very well have been the problem.
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Old 04-10-2015, 03:59 AM   #34
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No haven't even de-winterized yet. Just had the batteries in my basement so they didn't freeze over winter. And I thought black was always negative? So might very well have been the problem.
Yea, my trailer is still burried in snow but warm weather next week ....

Don't feel bad if that's the fault. Who ever decided that RV's should have black as positive has been cursed a million times I'm sure. Raz
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