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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: vjfelix55 on June 09, 2017, 02:15:25 am

Title: TURN SIGNALS AND BRAKE LIGHTS NOT WORKING NEED HELP ASAP
Post by: vjfelix55 on June 09, 2017, 02:15:25 am

Ok guys so on my 85 suburban k20 all of a sudden my brake lights completely stopped working and my turn signals are only working when I dont turn my lights on? If I turn the lights on both the lights in the dash stay lit and neither hazards or either turn signal does anything. What could be wrong? I checked the fuse and the fuse is fine and the blinkers work when I dont have my lights on but my break lights aren't working at all!! Any help is useful thanks guys

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Title: Re: TURN SIGNALS AND BRAKE LIGHTS NOT WORKING NEED HELP ASAP
Post by: big_al273 on June 09, 2017, 08:22:22 am

check/clean your electrical grounds, bad grounds can cause all kinds of weird stuff out of the blue

Title: Re: TURN SIGNALS AND BRAKE LIGHTS NOT WORKING NEED HELP ASAP
Post by: vjfelix55 on June 09, 2017, 11:15:20 am

Quote from: big_al273 on June 09, 2017, 08:22:22 am

check/clean your electrical grounds, bad grounds can cause all kinds of weird stuff out of the blue

I'll check them in a little while, do you think hot coolant that blew everywhere could have anything to do with it?

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Title: Re: TURN SIGNALS AND BRAKE LIGHTS NOT WORKING NEED HELP ASAP
Post by: vjfelix55 on June 09, 2017, 12:58:21 pm

OK so update it was the side marker bulbs, as soon as I plug the side marker bulb in the blinker would stop

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Title: Re: TURN SIGNALS AND BRAKE LIGHTS NOT WORKING NEED HELP ASAP
Post by: jptiger on June 09, 2017, 09:10:28 pm

Quote from: vjfelix55 on June 09, 2017, 02:15:25 am

Ok guys so on my 85 suburban k20 all of a sudden my brake lights completely stopped working and my turn signals are only working when I dont turn my lights on? If I turn the lights on both the lights in the dash stay lit and neither hazards or either turn signal does anything. What could be wrong? I checked the fuse and the fuse is fine and the blinkers work when I dont have my lights on but my break lights aren't working at all!! Any help is useful thanks guys

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I had a very similar problem after getting my truck back from paint shop. It took awhile but I eventually found bad ground at rear left light. Took housing off and small back wire to body wasn't making good connection. I took it off and filed around hole and crimp lug and it fixed mine. Hope this helps.


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Title: Re: TURN SIGNALS AND BRAKE LIGHTS NOT WORKING NEED HELP ASAP
Post by: jptiger on June 09, 2017, 09:22:32 pm

Ok I see you found it. Sorry should've read the whole thread.


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