Re: Headlight wiring help
read the instructions for your wiring harness to column wiring very carefully, you will see there are two ways to wire the brake/turn at the column, you want to use the way that uses a single brake/turn bulb. if you wire it as the separate brake turn bulb it will work the way you are describing, both sides flashing.
I have helped a lot of guys with their trucks and when they have this problem, this is the reason 95% of the time. last 5% time it wasnt that way was when there was a short in the socket.
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