Troubleshooting a 7-Way on a 2007 Chevy Silverado that Does Not Work with 4-Way Adapter

Updated 07/07/2014 | Published 07/04/2014

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Twist-in, 7-Pole, RV-Style Trailer Connector for Chevy and GMC Vehicles - Vehicle End

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Hook Probe Circuit Tester

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Question:

Hello, I have a Pollak PK11916 unit attached to the trailer wire harness that came with the vehicle. My vehicle is a 2007 Silverado new body style with the trailer package. I put a Pollak 4 pin adapter into the PK11916 but I get no power to the 4 pin connecter. Checking the power to the PK11916 with the lights on and I get a reading from one of the blades and the pins in the center of the unit. Any ideas as to what might be wrong? Thank you.

asked by: Mark B

Helpful Expert Reply:

First thing you need to is determine if all of the tail light circuits of the 7-way on your 2007 Chevy Silverado are functioning correctly. You will need to use a circuit tester like our part # PTW2993 for this. Test the pin in the 3:00 position for voltage when the right turn or brakes are applied.

Test the 9:00 position for voltage when the brakes or left blinker is on.
Test the 11:00 position for voltage when the headlights or running lights are on.

If the voltage all checks out in those places but your 4-way adapter is still not working the most likely problem is the adapter is messed up or it's not seating all the way into the 7-way enough to make contact.

If there wasn't voltage on the truck's 7-way then the first place I would check is the fuse box. Check all the trailer wiring fuses and relays. Next I would check the inside and back of the 7-way for corrosion and clean as necessary.

expert reply by: Jameson C