Wierd Trailer Harness problem - Chevy Trailblazer SS Forum
 

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Old May-10-17, 05:43 PM   #1

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Default Wierd Trailer Harness problem

Bought a new boat last weekend. Hooked up to the new trailer, and didn't get the results I had hoped for. Problems with the left turn signal.

Using the GM harness from the 7-pin under the rear valence to the 4-pin on the trailer.

I've verified on the trailer that all the wiring is correct, and that all the lights work with a strong 12V source with the below wire coding:

White = Ground
Brown = Running Lights
Green = Right Turn
Yellow = Left Turn

None of the "bright" portions of the left signal are working from the truck. Left Turn, Hazards, or Brake Light are all inop. I used a volt meter to check with a friend holding the brake. On the 7-pin under the rear valence, I get zero volts on yellow wire, and ~0.5 volts on the brown wire when the brake is depressed (unless running lights are on, then it stays constant 12.5V). All other pins work as expected.

So far I cleaned the white ground connection behind the rear tire. I've checked all of the fuses in the block under the drivers side rear seat.

I'm at a loss of what is going on here. Can anyone point me in the right direction?
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Old May-10-17, 05:50 PM   #2

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This is funny that this because I JUST had the same problem last weekend, when I was picking up my car trailer. The previous owner had the 4 pin to seven pin adapter that was hooked right into the harness for the 7 pin. Mine was corroded connections inside the seven pin pigtail that hooks into the actual 7 pin socket. I ended up just replacing the 7 pin socket with the flip up face and it made everything work. I also know that the fuses are all located under the hood for the trailer. I would check all the trailer fuses for the correct size fuses.


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Old May-10-17, 06:20 PM   #3

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Quote:
Originally Posted by Dans07 View Post
This is funny that this because I JUST had the same problem last weekend, when I was picking up my car trailer. The previous owner had the 4 pin to seven pin adapter that was hooked right into the harness for the 7 pin. Mine was corroded connections inside the seven pin pigtail that hooks into the actual 7 pin socket. I ended up just replacing the 7 pin socket with the flip up face and it made everything work. I also know that the fuses are all located under the hood for the trailer. I would check all the trailer fuses for the correct size fuses.


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OK, so you replaced the female socket that is on the truck side of the harness or the male plug side that was part of the 7-pin to 4-pin adapter harness? If that is the case, where did you mount the "flip up face socket"?

My truck has a fair bit of corrosion overall (originally a Canadian truck out of Winnipeg) so I don't mind replacing that connector if it has an internal corrosion problem. Just want to make sure thats the problem before I go through all that.

Last edited by 2kwik4u; May-10-17 at 06:22 PM.
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Old May-10-17, 06:23 PM   #4

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I replaced this part

I simply zip tied it up for now. It will make a. We spot for it when I get done with race car shiz. Hah.


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Old May-10-17, 06:26 PM   #5

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I was having the same issues with my lights being dim, only one side was flashing with my flashers, and marker lights didn't even work. That part I got from the dealership where I bought my truck. I have corrosion issues as well. I bought it out of Washington. Montana thankfully only uses dirt. Which sucks for our rocker-panels. We just can't win. Hahaha.


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Old May-10-17, 07:15 PM   #6
 
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I also have a replacement female 7pole receptacle ziptied in place. Factory one was pretty nasty

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Old May-10-17, 07:36 PM   #7

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Thanks guys!

Any reccomendation on where to get that flip up 7-pin socket?
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Old May-10-17, 08:51 PM   #8
 
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At the underhood fuse block, check fuse #51, TRLR LT TRN, 10a.
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Old May-12-17, 11:42 AM   #9

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Default Wierd Trailer Harness problem

Quote:
Originally Posted by 2kwik4u View Post
Thanks guys!

Any reccomendation on where to get that flip up 7-pin socket?


Stealership or any trailer dealership place should have them bro.


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Old May-12-17, 02:24 PM   #10
 
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My left turn signal had the same issue and it was the fuse then it did it again months later and ended up being the actual light on the trailer. I also picked up a 7 pin socket from pep boys but not sure where you are located i think i paid around $25 but can't remember exactly as this was years and years ago.

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Old May-13-17, 04:39 PM   #11

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Quote:
Originally Posted by Branndonw View Post
At the underhood fuse block, check fuse #51, TRLR LT TRN, 10a.
Nailed it!

I feel like quite the dummy. I thought all the trailer fuses were under the rear seat so I didn't even check the underhand block. Replaced the 10 fuel and all is good again on the trailer!
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