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Old 05-31-2014, 04:26 PM   #1
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7 pin issue

Have an issue when I plug my trailer into tow vehicle my right brake light stays on and no other lights work.. I've tested the trailer and everything checks out ok . So I have moved on to tow vehicle . Started testing pins and I have power to top 4 pins for some unknown reason ? Any thoughts
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Old 05-31-2014, 04:32 PM   #2
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Possible internal corrosion in plug? How old is it, got a boat you put in the water a lot?
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Old 05-31-2014, 04:37 PM   #3
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Year old and have pulled plug apart and no corrosion noted.. Showing 13.6 volts on top 4 pins when only one should have power without brake pressed or blinker on.
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Old 05-31-2014, 04:44 PM   #4
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I am sure you have a diagram, if not here is one.

Sounds like something is shorted somewhere. Either in the plug or back towards the engine bay.

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Old 05-31-2014, 04:48 PM   #5
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I'm getting ready to trace all wires back
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Old 05-31-2014, 04:49 PM   #6
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Thanks for the diagram !
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Old 05-31-2014, 06:33 PM   #7
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Ended up just cutting out the whole controller and ordered a new one.
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Old 06-01-2014, 10:51 AM   #8
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Not sure if you found your problem but I had some issues similar and it ended up being a controller under the dash.
This is my post:
solved, wierd trailer light issue
Good luck
John
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Old 06-01-2014, 12:46 PM   #9
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New controller on order from Curt. When I pulled the old one out it was warped from heat and cracked so I'm assuming this should correct the issue I'm having. Thanks for all the help.
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