how do i change the wiring harness in my 2002 chevy express van conversion on 2002 Chevrolet Express 1500

when my lights are off the brake lights turn on,but when i turn my park or headlights on my brake lights dont turn on when i press on the brakes bought new tail light harness need to no how to install them on a van conversion.hope this solve the brake light issues.

by in Modesto, CA on September 11, 2013
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1 answer
ANSWER by , September 11, 2013
Problem is the ground circuit in the bulb sockets! Replace them.