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Old 03-11-2014, 02:19 PM   #11
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So the 7 pin sparks when you plug it in. Its a new to you trailer, so your sure the battery in the trailer is in good working order?
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Old 03-11-2014, 06:01 PM   #12
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Reference for trailer wiring
Trailer Wiring Diagrams | etrailer.com
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Old 03-12-2014, 12:27 AM   #13
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JB It's supposedly a "new"battery. But I trust the dealer as far as I can throw them
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Old 03-12-2014, 10:00 AM   #14
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Id check to make sure the battery is connected properly, make sure there is no battery disconnect switch as well. If the wiring is in good working order, I can only think that the battery is either so low on power, or disconnected that when you plug in the trailer is drawing heavilly. There is the possiblity of a short in the 7 pin for the charge lead, but you have to start somewhere in diagnosing the issue.
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Old 03-12-2014, 10:21 AM   #15
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Would it make sense to plug the 7-pin into another truck to see if you blow a fuse in that one? Could it help isolate if it is your truck or your camper?
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Old 03-12-2014, 10:28 AM   #16
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Another thing to try to isolate the issue is to disconnect the wire at the battery and then plug in the trailer. If fuse holds, then issue is with battery as any short in the wiring would still blow the fuse. It could be the battery is so dead it draws a high load. Have you checked the water in the battery? have you charged the battery on battery charger?
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Old 03-12-2014, 02:26 PM   #17
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On a previous post you were looking for a brake controller and harness to connect to your factory installed connector. You mentioned you got what you needed from eTrailer. I assume you have installed this. Just to isolate the controller, unplug it from under your dash to ensure it is not the issue. I should not be but if for some reason eTrailer hooked you up with the wrong harness there might? be an issue.

If that is not the problem disconnect the plug, replace the fuse and then use a VOM to ensue you have 12v on the truck side and 12v on the trailer side. If either connector does not measure any voltage you can then check the resistance with the ohm meter to see if you have a short. This could be mis-leading if you have any voltage at all on the pins. Use the reference Trailer Wiring Diagrams | etrailer.com
Also as posted previous, disconnect the trailer battery to see if it is an issue. Do the trailer lights and other DC stuff on the trailer work? It would seem battery is connected correctly, especially if the radio works.
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