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Old 08-21-2019, 12:09 PM   #1
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trailer wiring

HI when i hook my truck to the trailer and plug it in ,it blows the charging fuse on my truck, if not pluged in it is fine, the fuse is the big 30 amp under the hood, on a 02 2500 gmc the trailer plug on the the truck is factory, not after market.

Has anyone else had this problem thanks Alleycat
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Old 08-21-2019, 12:12 PM   #2
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By any chance did you hook up the trailer battery backwards?
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Old 08-21-2019, 12:22 PM   #3
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wiring

I have only had the trailer for a short while , the battery was in it when i got it
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Old 08-21-2019, 01:07 PM   #4
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Disconnect the battery and see if it still blows the fuse. Could be the battery is connected wrong or if someone changed the trailer plug on the trailer they may have wired it wrong.
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Old 08-21-2019, 01:59 PM   #5
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This is the wiring diagram for the rv end.
https://www.etrailer.com/question-252629.html
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Old 08-22-2019, 06:47 AM   #6
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I checked the battery yesterday it's wired up properly check the trailer plug on my truck gets wired up properly so I'm not sure, right now on the wire that feeds the trailer plug in my truck which is in the fuse panel under the hood it has a 30 amp fuse in it maybe the fuse might not be heavy enough
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Old 08-22-2019, 06:48 AM   #7
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Thanks for the advice
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Old 08-22-2019, 07:04 AM   #8
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Check the 7 way plug on the camper. Sometimes with a used camper it may have been changed and not wired correctly.
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Old 08-22-2019, 07:09 AM   #9
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Check the junction box for the obvious loose wire( should be on the frame near the front). Then disconnect the tail light wire from the harness and plug the harness into the truck if it dosn't blow a fuse then you know your good to the juction box. Next, go back to the tail light wire and use an ohm meter touch it to the wire and to the frame, if you get a reading or beep depending on the tester that will tell you you have a short some where in the trailer, then start looking at fixturesfor loose wires.
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Old 08-22-2019, 07:10 AM   #10
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I'll give that a check tonight okay thank you very much
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