7 way plug tester
I have 2 trailer connections on my truck....the one in the bed quit sending power to the brakes. The one in the bumper works fine. So I bought a tester at Northern Tool and with my wife's help we tr...
Forum Discussion
Your GMC truck needs a fuse for the brake controller to send power to the trailer brakes. You can go to your dealer to have them install a 40 or maybe a 50amp maxi fuse.
The 7 way connector has a ground connector that the tester would use.
The 7 way connector has a ground connector that the tester would use.
