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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: 197 on March 16, 2008, 09:09:57 PM

Title: Break Lights/Wireing
Post by: 197 on March 16, 2008, 09:09:57 PM

Tonight I went to drive my truck 73' C20 454. When I turned the headlights on all I got was Headlights and front marker lights. No Flashers, Break, Tail or Blinkers. I replaced the brake light fuse and got brake lights and blinkers but still no Tail Lights?

Tips?

Anyone have a wiring digram?

Title: Re: Break Lights/Wireing
Post by: 76_Scottsdale on March 17, 2008, 01:02:41 AM

I would try replacing the flasher cans

Title: Re: Break Lights/Wireing
Post by: joesgarage71 on March 17, 2008, 10:39:10 AM

  There might be a wire grounding out in the rear or on the frame to make the fuse blow. check the harness conections too.

Title: Re: Break Lights/Wireing
Post by: 197 on March 17, 2008, 07:53:10 PM

Update: When ingtion is on and I turn a blinker on they all flash like the hazzards. If I turn the headlights on with the blinker on it will either flash slow or go solid dim. With the light on I have front marker lights and headlights nothing else on the exterior.

Could it be the turn signal switch?

Title: Re: Break Lights/Wireing
Post by: VileZambonie on March 17, 2008, 08:12:40 PM

unplug the tail light connector and see what it does.

Title: Re: Break Lights/Wireing
Post by: 197 on March 17, 2008, 08:25:40 PM

Did that, its getting power there.

Title: Re: Break Lights/Wireing
Post by: VileZambonie on March 17, 2008, 08:28:00 PM

no, unplug the rear harness connector near the tailgate. Then see what happens when you turn on your lights, signals etc. with the rear lamps out of the picture.

Title: Re: Break Lights/Wireing
Post by: 197 on March 17, 2008, 08:43:50 PM

With the rear unpluged the front lights work like they should.

Title: Re: Break Lights/Wireing
Post by: VileZambonie on March 17, 2008, 08:44:49 PM

OK so check each bulb socket and make sure the ground wires at each side are clean and tight.

Title: Re: Break Lights/Wireing
Post by: 197 on March 17, 2008, 09:07:27 PM

Thanks! It was the left side that wasn't grounded correctly.