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Trailer Wiring

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
The brake light switch is at the top of the brake pedal.
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
  • MEMBER
  • 0 POST
  • 2004 CHEVROLET SILVERADO
  • 140,000 MILES
What do the five colored wires do in a electrical mirror. Trying to figure out what five wires do so I can wire 2003 extended trailer mirrors in there place m
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
See below
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
WCOUS2
  • MEMBER
  • 3 POSTS
  • 2003 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 84,000 MILES
Electrical problem
2003 Chevy Silverado V8 Two Wheel Drive Automatic 84000 miles

What is the wiring schematic for the rear 7 pin factory plug?
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Monday, June 5th, 2017 AT 5:08 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
My info shows this.


https://www.2carpros.com/forum/automotive_pictures/170934_silverado_trailer_lamps_1.jpg

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Monday, June 5th, 2017 AT 5:08 PM (Merged)
Tiny
NICKHANSEN28
  • MEMBER
  • 3 POSTS
Hey all, I know this thread is old but I am having the same problem multiple of you have mentioned here. When I turn on the right turn signal, both turn signals on the trailer blink. When I step on the brakes only the right brake works. The left blinker works with no issues. Running lights all good. Anyone ever fix this problem? I replaced the female connector on the truck and it still does the same thing. I have tried multiple trailers and it does the same.

Any help? Thanks
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Sunday, July 7th, 2019 AT 6:04 PM
Tiny
NICKHANSEN28
  • MEMBER
  • 3 POSTS
I should add this is on a 2005 Tahoe
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Sunday, July 7th, 2019 AT 6:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,380 POSTS
When the trailer is not connected do the lights work correctly? If not I would replace the flasher module they have problem here is the location. Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Monday, July 8th, 2019 AT 10:27 AM
Tiny
NICKHANSEN28
  • MEMBER
  • 3 POSTS
The lights on the truck always work normally with or without the trailer plugged in. The trailer works normal on all other vehicles but mine. When I took part the 7 prong female plug on the truck side, it is sending a signal for the left and right blinker (or hazard lights?) When I turn on the right blinker. The left blinker operates normally on the trailer when I signal left on the truck.
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Monday, July 8th, 2019 AT 10:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,380 POSTS
It sounds like the trailer wiring or the truck plug wiring is the issue. Here is the trailer wiring so you can check the power output:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what you find.
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Tuesday, July 9th, 2019 AT 9:54 AM

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