Check Trailer Wiring Warning - Dodge Cummins Diesel Forum
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post #1 of 12 (permalink) Old 07-15-2019, 08:39 PM Thread Starter
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Check Trailer Wiring Warning

I get the check trailer wiring when it is raining or wet. I just hooked up my trailer and only have signal lights and no running lights or brakes. Could this be in the plug?

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post #2 of 12 (permalink) Old 07-15-2019, 08:45 PM
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there are 2 or 3 fuses for the trailer wiring. common problem. check back of plug behind bumper unplug clean and put some dielectric grease in it. mine does it randomly too.

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post #3 of 12 (permalink) Old 07-15-2019, 09:01 PM
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If you don't have any blown fuses, put dielectric grease on the pins in the socket at the bumper and make sure the plug is inserted firmly. If I half a** putting the plug in I have the same issues.

edit... why is it not letting me use the word a**?

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post #4 of 12 (permalink) Old 07-15-2019, 09:16 PM
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Quote:
Originally Posted by RossThompson View Post
If you don't have any blown fuses, put dielectric grease on the pins in the socket at the bumper and make sure the plug is inserted firmly. If I half a** putting the plug in I have the same issues.

edit... why is it not letting me use the word a**?
Profanity filtering software.


As to the OP's issue, often this message happens when the ground isn't good.

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post #5 of 12 (permalink) Old 07-15-2019, 10:14 PM
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Quote:
Originally Posted by RossThompson View Post
If you don't have any blown fuses, put dielectric grease on the pins in the socket at the bumper and make sure the plug is inserted firmly. If I half a** putting the plug in I have the same issues.

edit... why is it not letting me use the word a**?
Were you trying to say.......gluteus maximus.... gluteus medius.... gluteus minimus?
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post #6 of 12 (permalink) Old 07-16-2019, 07:55 AM
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Quote:
Originally Posted by RossThompson View Post
If you don't have any blown fuses, put dielectric grease on the pins in the socket at the bumper and make sure the plug is inserted firmly. If I half a** putting the plug in I have the same issues.

edit... why is it not letting me use the word a**?
I have the same issue if I half azzed insert the plug also!!!!!! , ,
I also have the other issue if I half azzed avoid using profanity!!!!! , ,
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post #7 of 12 (permalink) Old 07-16-2019, 01:19 PM
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Yes i agree on the ground issue. Check to be sure that the ground circuit on the trailer is healthy and that it actually grounds to the truck wiring. Some trailers will ground on the ball/hitch itself and will appear to work fine when there is good contact there but they get disrupted and malfunction when that ground path is lost. Some trailers ground all of the lights and brakes to the frame at the fixture then ground the frame to the wiring at the hitch any break of contact with that frame will result in a malfunction. You could actually start to blow fuses too if you turn activate all of the lights at the same time when you have a shiddy ground. OK i got mine in there too. LOL
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post #8 of 12 (permalink) Old 07-17-2019, 11:46 AM Thread Starter
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Thanks guys will be checking all of these this weekend. Wish me luck
Thanks Bill
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post #9 of 12 (permalink) Old 07-17-2019, 02:28 PM
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Your problem may be the plug on the trailer. I understand that some plugs are too small in diameter and lead to problems. Apparently the Pollack plug is the one that fits best and the one that the receptacle was designed for.

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post #10 of 12 (permalink) Old 07-17-2019, 07:51 PM
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I've had that happen to me before. Water in the 7 pin on the truck. Did it with no trailer attached at all.

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post #11 of 12 (permalink) Old 07-19-2019, 01:06 PM
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I had a like issue. It was the trailer. It is a brand new travel trailer but the grounding wire was not grounded to the trailer. I greased the hitch ball and went down the road. Nothing worked for a while and then things started to light up and the brakes came back intermittently. I assumed it to be the truck. But, took another trip, greased the ball and same thing. Nothing at first but the more I traveled, the more things started to work. So, I stopped, wiped the ball and the inside of the hitch and everything worked great! I then followed the wire to find it was loose on a frame mount. Loose like it was flopping about.

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post #12 of 12 (permalink) Old 07-19-2019, 01:26 PM
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Not sure I would use dielectric grease. (we used to use this on top of GM HEI distributor shafts to stop the roter from conducting the spark to ground through plastic to top of distributor shaft.)

A dielectric (or dielectric material) is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor but only slightly shift from their average equilibrium positions causing dielectric polarization.

I would use something like Gardner Bende Ox-Gard Anti-Oxidant Compound


The perfect safeguard for aluminum-to-aluminum, aluminum-to-copper wire connections and aluminum conduit joints

Guards against oxidation

Improves conductivity; penetrates aluminum oxide to maintain inter-strand and inter-conductor current paths

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