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Auxiliary 12v Fuse Block Problem(2007 Silveraldo Gmt900)

3FAN4EVR

By 3FAN4EVR
in Towing, Hauling & Hitches

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3FAN4EVR Enthusiast

3FAN4EVR

Posted
Posted

Hi There, I took my truck to the dealer to install a brake controller. They hooked everything up correctly(the trailer brake power wire to big post, and the auxiliary 12V to the smaller post) with a 40 amp-j fuse for the auxiliary 12V. The problem is I have no power to the auxiliary lights inside my trailer. I checked the fuse and it's fine. I took a test light to see if I have power at the fuse block where the fuse goes and it has power. I put the 40 amp-j fuse in and I still have no power at the auxiliary 12V post on the fuse block. What could be the problem??? Any suggestions??? 2007 LT Silveraldo (next generation GMT900) Crew Cab.

SparkySparks Enthusiast

SparkySparks

Posted
Posted

Not sure if this will help but check this post to confirm its hooked up correctly, when I hooked mine up I had to install a 30amp for the controller and a 40amp for the 7-pin.

 

Connecting 12v Lead For Trailer Harness

  • 3 weeks later...
  • 4 weeks later...
Ramsco New Member

Ramsco

Posted
Posted

I watched a video of installing a trailer brake controller on "etrailer" and it shows changing out the 7-pin female plug at the back of the truck.

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