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#1
10-06-2021, 11:55 AM
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TRAILER WIRING ?
I have a 1991 steel bed 18' trailer. I bought it brand new.
It sits in my shed all year with the mice. I took it out a couple months ago to tow my new tractor. And noticed the trailer lights not working. I found several chewed wires and repaired them. ALL the lights are working properly, running, turn and stop and they are bright. But when I hook it up tp my2017 Silverado I get a ding,ding,ding and a message on the dash "check trailer wiring" ding,ding,ding. What's going on ?
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 3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" Last edited by Stuart; 10-07-2021 at 11:16 AM. |
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#2
10-06-2021, 01:06 PM
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If your truck has OEM trailer hookup it might be expecting to see brakes. There is also a different standard for plugs now I think .... something like seven wire vs six wire ... I forget.
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#3
10-06-2021, 01:31 PM
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Have you towed the trailer before with this truck and lights work?
My first clueless wild guess would be the trailer has standard brake/turn and the truck has seperate brake/turn. Clay |
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#4
10-06-2021, 02:20 PM
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I’m by no means an expert, but did have trailer light issues recently with my 2011 Silverado.
Did you check the fuses? I figured my trailer lights would simply run through the fuses for the trucks tail/brake lights, not so. The trailer wiring has its own fuses separate from the truck lights. I never knew that, and made an easy fix.
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 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
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#5
10-06-2021, 04:43 PM
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It's normally a ground issue.
From google:
Why does my truck keep saying check trailer wiring? This condition is most likely caused by insufficient trailer grounding and the trailer ground wiring will need to be repaired and/or upgraded. 2. These concerns could be caused by a poor connection at the 7-way trailer connector. It could be either the truck and/or trailer side of the connector. Several other sites pointed out chewed-on wiring causing the bad connection. NHTSA says NOTE: It is normal for the DIC to display "Check Trailer Wiring" when the trailer is disconnected from the truck while the ignition is in the run position. - Check Trailer Wiring message with DTC C1114 (NO Service Trailer Brake message). ... This symptom is caused by a short to power on circuit 47 or a poor trailer ground. Good luck! |
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#6
10-07-2021, 08:07 AM
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I had the same message on 2 newer 2021 GMC diesel trucks. Same trailer. Wire on brakes shorted to ground and I found blown fuse for trailer brakes on both trucks. Repaired wire installed new fuses everything ok.
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#7
10-07-2021, 12:03 PM
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Quote:
I agree with the ground issue, gotta look.
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3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" Last edited by Old Goat Racer; 10-07-2021 at 12:20 PM. |
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#8
10-07-2021, 03:09 PM
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Ground is secure at the junction box but from there all wires go inside the box frame. 30 years mite be time to rewire the whole trailer ?
THANKS TO THE MOD WHO CORRECTED MY MISPELLED (WIREING). 
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3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" |
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#9
10-07-2021, 03:41 PM
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When I built my open trailer 35 yrs ago I ran the wires through metal conduit. Left and right wiring separate till they junction at front. So mice can only get at wiring in the front.
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