Question about 2004 Dodge Ram 2500

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No trailer right turn signal or brake light

All lights work on the truck, only the right turn and brake lights won't work on the trailer connector (both 4 pin & 7 pin connectors)

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Hey Boon,

The pinouts for a 7-way plug are as follows:
Seven wire Trailer plugs:

Horse, stock or utility trailers:

White = Ground - 1
Blue = Electric Brakes - 2
Brown = Tail and clearance lights - 3
Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

Recreational Vehicle:
White = Ground - 1
Blue = Electric Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
Red = Left turn/Brake - 5
Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7

In both cases 4 is battery and 7 is reverse, aux or not used.

Double check your wiring using these lists as a reference.

Click here for my post on Trailer wiring

This should get us closer to the answer.

Best regards,
Mike

Posted on Sep 09, 2009

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I had that problem. I purchased a engine diagnostic and trouble . code reader and cleared the DTC. it took about 3 times. I then purchased a Super Chip Tuner from Summit Racing and installed the new tuning , I then checked the trailer lights (brake and turn lights) they are working fine!! now. I think when I first cleared the DTC,s that fix it. or The Super Chips Tuner fix the problem. Martin

Posted on Oct 19, 2009

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Sounds like a short in the wires between the vehicle wiring and the trailer plug. probably a corrosion problem because most poeple, including the factory, don't protect the trailer harness as well as they should. i would replace the wires that go to the specific contacts with the problems, if you want the cheap way. if you want the best way replace everything from the body harness all the way, including the 4 and 7 pin connectors. Napa sells a great combo connector that i use on nearly all vehicles. whatever you do, remember, there is no such thing as too much electrical tape or heat shrink. put a good protective layer of something on the harness to protect it against the elements.

Posted on Sep 08, 2009

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Did you check for power with a test light right at the connectors?? If so, follow and visually check the wiring from the connectors back to the "t plugin", which is the point where the wiring to the trailer connectors tee off the wiring to the truck tail lights. The 7 pin has a separate connection for brake lights but the 4 pin doesn't... 4 pin connectors have Left turn/stop, Right turn/stop, Park (tail) light, and ground, so it uses a combination of left turn and right turn for the brake lights...

Posted on Sep 08, 2009

  • Denis Aube Sep 08, 2009

    Did you check for power with a test light right at the connectors?? If so, follow and visually check the wiring from the connectors back to the "t plugin", which is the point where the wiring to the trailer connectors tee off the wiring to the truck tail lights. The 7 pin has a separate connection for brake lights but the 4 pin doesn't... 4 pin connectors have Left turn/stop, Right turn/stop, Park (tail) light, and ground, so it uses a combination of left turn and right turn for the brake lights...

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accessconnect_logo.jpg


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4%20way%20wiring.jpg 4way_vehicle.jpg 4 way tow vehicle side.
4way_trailer.jpg 4 way trailer side.
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5way_vehicle.jpg 5 way tow vehicle side.
5way_trailer.jpg 5 way trailer side.
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6way_rectangle_1.jpg 6 way tow vehicle side.
6way_rectangle_2.jpg 6 way trailer side.
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6way_vehicle.jpg 6 way tow vehicle side.
6way_trailer.jpg 6 way trailer side.
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