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Old 02-03-2019, 04:27 PM   #1
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M.O.C. #19521
runing lights

I have a 2009 3665RE. I am trying to figure out why my running light are on and I am not plugged into my truck. The # 3 terminal on my plug shows 7 volts. I do not know where the plug hot wire is connected to the trailer battery is to disconnect it. We have been in the same place for 6 months sense we used the truck. It has been raining and there was some wind day before yesterday. Do not know what would cause a problem with the wiring with no trailer movement. The plug and out side wires are dry and rolled up under the hitch. Has anyone had this problem before????
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Old 02-03-2019, 05:10 PM   #2
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M.O.C. #20747
I would start by pulling the cover off the 4 in. junction box under the hitch and looking for a short.
Frank and Marilyn
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Old 02-03-2019, 05:35 PM   #3
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M.O.C. #22087
That would be my first place to start looking.
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Old 02-03-2019, 08:18 PM   #4
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Check cable for varmints eating the wire. Had one here raccoons climbed in pin box for a wire lunch
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Old 02-04-2019, 10:06 AM   #5
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M.O.C. #18157
Could also be something else seeking a ground, maybe remove one 12V fuse at a time and see if the lights go out. Also clean and re-install the chassis ground. Electricity is a fickle beast, but it needs a good ground.


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Old 02-04-2019, 11:05 AM   #6
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M.O.C. #6433
Pin 4 in that same connector is +12v. I would check the J box wiring, the cable, and the connector to see if there is any damage to any of those.

As noted above, a bad ground on one thing can cause unexpected voltage on something else. Not unusual for a trailer with a bad ground to have running lights blinking when a turn signal is turned on. But that should be limited to something in the stop/turn/running light wiring.
Bill & Patricia

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