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Old 07-30-2019, 07:55 PM   #1
Dgentry28
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Trailer Wire Diagram

Had a dumb mistake today, pulling away from the fifth wheel my 7 pin plug got caught and ripped all the wires out of the junction box. Opened the box and it all the wires came loose except for the the white wire. Does anyone have a diagram on how all the wires connect in the junction box? I've searched the site and can't seem to find anything.

The unit 2019 3791RL.

Thanks,
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Old 07-30-2019, 08:29 PM   #2
dieselguy
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White is ground / red is 12 VDC+ / green is RH turn and stop lights / yellow is LH turn and stop lights / blue is trailer brakes / brown is clearance lights and tail lights
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Old 07-30-2019, 09:53 PM   #3
Daryles
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Found this on etrailer.
https://www.etrailer.com/faq-wiring.aspx
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Old 07-31-2019, 06:41 AM   #4
Dgentry28
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Thanks for the information on the wire. I have that taken care of. Now, I have two black wires and 1 blue wire from the trailer side. I know the blue wire is the electric brake, but I'm not sure if the 2 remaining black wires connect to the blue wire.

Called Keystone, that was pretty much a waste.
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Old 07-31-2019, 07:05 AM   #5
Daryles
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Black is usually a ground. You can use a multi meter to figure it out. Meter set to ohm's, touch one meter lead to the black wire and the other lead to the trailer chassis. If it goes to 0 ohms it is a ground wire. If it doesn't?????? More troubleshooting and tracing......
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Old 07-31-2019, 07:06 AM   #6
Daryles
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If I was home I would go open my junction box and take a picture for you ....
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Old 07-31-2019, 07:51 AM   #7
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The only thing that I would mention is on our 2017 when I changed out the tail lights I found that the brake light and the turn signal wires were reversed.
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Old 07-31-2019, 09:13 AM   #8
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I think if you trace the black wires, they are going to your breakaway switch on the pin box. One goes to 12 VDC+ and the other to blue wire. Blue wire goes to brake wire from your TV usually blue as well. The breakaway wires connections don't matter which goes where.
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Old 07-31-2019, 05:52 PM   #9
Dgentry28
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Thanks for the all the help All taken care of
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Old 08-13-2019, 12:23 PM   #10
Garybricker
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Thumbs up Plug change

If you end up changing the plug Amazon has a really nice plug with about 6 ft of cord and a very nice color coded connection box.
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Old 08-13-2019, 04:02 PM   #11
Mikendebbie
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Wires

I went out and took a pic of mine...maybe you can see what goes where.
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Old 08-13-2019, 04:43 PM   #12
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For future responders ... the OP stated on 7-31 that he had it all taken care of and thanked all for the help. I'm sometimes guilty as well for not fully reading thru all replies.
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