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brake lights/turn signal problem

Guest ufo builder

By Guest ufo builder
in 1999-2013 Silverado 1500 & Sierra 1500

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Guest ufo builder

Guest ufo builder

Posted
Posted
I know, electrical problems aren't easy to diagnose but here goes...   The turn signals on my 99 Z71 are affected when the brake pedal is pushed.  The flasher clicks faster, and when viewed from behind the truck, the yellow signal lamps dim, the brake lamps are dim (and they both blink along with the turn lamps), and the high center brake lamp starts blinking also.  I've been studying my factory manuals and looking for a grounding problem.  I cycled the four connectors at the connection block at the rear of the truck... with no improvement.  Obviously there is some kind of voltage backfeed between the turn signal circuit and the brake lamp circuit.  All fuses are good. Brake lights work normally otherwise...  Any ideas?
BlueRado Enthusiast

BlueRado

Posted
Posted

Welcome aboard, BTW!  

 

The only advice I can offer is to be sure you have discounted moisture or crud/dirt buildup in the bulb sockets, but also around the connector where the wires enter.  Might be a good idea to test all fuses and trace wiring as best as you can.  You have probably already done these things, but that's all I can think of.  Good luck and keep us posted. :cheers:

Guest ufo builder

Guest ufo builder

Posted
Posted

Thanks for the friendly welcome!  Today I started tracking down the light problem on my truck...  the rear tail lights, turn signals and brake lights were grounding through each others' circuits.  I lowered the spare and checked the chassis ground wire attached to the spare winch mount.  Sure enough, it was loose.  I tightened the bolt on the ground wire and... joy... lights are working perfectly again.

    Next fix will be to check out the O2 sensor #2 in bank one.  It's showing a low voltage trouble code PO137.  The best gas mileage I've been getting lately is 16.5 highway, so I'm hoping that fixing this may help raise it up a little. :rolleyes:

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