73-87 Chevy _ GMC Trucks > Electrical

Headlight and signal problem

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86chevytrk:
Hello, I too have made the grave mistake of reverse hookup of the battery. It burned the ground wire to the support. I replaced and repaired what I’ve found so far. I have variety problems still but my main concern today are the signals. I have power to start, run and drive. But when I turn on the headlights both directional arrows light up. When I signal either way, the opposite arrow stays lit and flashes only once. I replaced the headlight switch in hopes to fix the problem but all I got is a shiny new switch. When the headlights are off the signals work but seem labored. I’m working on a 85 c20 with the 350 gas engine. Please help me fix this problem as my butt is starting to hurt from kicking it. Thank you in advance.

bd:
Check ALL of the vehicle grounds.  You can find an inventory of their locations near the end of the tech article Vehicle Ground.

roundhouse:
You might want to replace the turn signal switch on the steering wheel

They are cheap and easy to do
Just remember when you pull the old wire out of the column to tie some fishing line to it and pull the fishing  line in and then you can use that pull the new wire back down

And check the brake light switch and make sure it’s working right

You also need to check each light and make sure the bulb and the socket are in good condition with no shorts

The only place the parking lights and turn signals wires can get crossed is in the socket or bulb
They do not connect to each other anywhere

86chevytrk:
I’ve been at it for awhile now and starting to lose my mind. Thanks bd and round, I will update when I find the cause of this ridiculous problem.

bd:
The proper function of all things electrical hinges on good grounds.  In fact, legendary hauntings can be traced back to poor grounds.  So begin there.  Concentrate your efforts on the dash grounds to cabin sheet metal under the dash and between the firewall and right rear cylinder head.  Also, verify the battery negative to engine block ground connections.  You may benefit from new turn and hazard flashers too.

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