7 Pin Plug, No Power To Backup Lights

[bmklawt]

Hello,

 

First post, I am happy to have found this forum, I have a 2005 Silverado and this is the first time I have had any trouble with it.

 

There is no power to the backup light pin (center pin) on the 7 pin trailer connector when the vehicle is in reverse, everything else works right. Am I missing something, I can not find a fuse for the backup lights or is is something else.

The reverse lights on the truck work fine.

 

Your help is much appreciated.

[silveradobobby]

i will have to look but in the main fuse panel there should be a set of fuses for the trailing package and plug check there first.

[Draenor]

Hello,

 

First post, I am happy to have found this forum, I have a 2005 Silverado and this is the first time I have had any trouble with it.

 

There is no power to the backup light pin (center pin) on the 7 pin trailer connector when the vehicle is in reverse, everything else works right. Am I missing something, I can not find a fuse for the backup lights or is is something else.

The reverse lights on the truck work fine.

 

Your help is much appreciated.

It should be the light green wire. I can't recall, but I dont think it is the center pin.

[VR021302]

 

I thought the center was ground

[Draenor]

I thought the center was ground

I dont think that is correct either. I thought it was for aux power(12+Red).

 

 

 

FWIW, I just wired up a connector to use in my bed to pull a gooseneck. I had a hell of a time trying to get it to work. Almost every diagram I found online was incorrect. The easiest thing for me to say f' it and get the 'ol DMM out and verify each pin out. I dont recall where the pins were located but I do remember which color wires went where. You may have to do the same.

[silveradobobby]

The center pin is the back up or aux pin most of the time you have to wire it up as it is a aux pin. The back up light wire will be a lt green wire most of the time. pin 1 is the ground usually wire wire, pin 2 brakes blue, pin 3 tail lights brown, pin 4 12v black, pin 5 left turn yellow, pin 6 right turn green. Hopefull this helps.

[bmklawt]

Thanks everyone for the help,

 

The center pin is the backup lights, the cover of the trailer 7 pin connector has the pin out molded into the cover.

 

I finally found the wiring schematic for the trailer wiring in the service manual and it does show a fuse for the backup lights under the hood. There is no mention of trailer wiring in the index of the service manual so I went through 200 pages of print twice and found it.

I went back under the hood and found fuse "TRL B/U" that makes perfect sense now.

 

I had checked that fuse earlier and it checked good, I also had looked in the owners manual for the fuse description but must have missed it, it is there.

When I check the fuse earlier with a fuse checker it checked good, after finding the info in the book I went back to the "TRL B/U" fuse and actually pulled it out, it looks good so I tested it with the fuse checker while holding it in my had and found that there must be a break in the fuse, it would show good intermittently, the fuse is not blown.

I think when I pressed the pins of the fuse checker into the fuse it would move it enough that where ever it is broke would make contact and show the fuse a good

I put an ohm meter on the pins of the fuse and it read open and when I jiggled the pins of the fuse just right I could get a good reading so I replaced the fuse and all is well.

 

10 hours of my life down the tubes because a fuse was bad