Question about 2005 Chevrolet Tahoe

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Turn signals going crazy when I push on the brakes

I turn on the turn signal and push on the brake and both brake lights flash and both turn signals on the rear of the tahoe and the mirror turn signals flash. Also when just applying the brake the turn signals on the back light up and the mirror turn signals too.

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  • ScottyDenver May 04, 2009

    I have a very similar problem, the turn signals flash faster during the day when you apply the brake. At night, they display the symptom you are talking about here. It happens when you turn on the lights, or when you turn on the driving lights (at night when in automatic mode too). My tail lights are dim, the rear turn indicators are very dim.

    Is this all the turn signal switch in the column causing this problem?

    I've checked all the bulbs, replaced the tail-light bulbs, not sure they were bad, but they looked bad, might have just been dim. I checked all the fuses and flashers / relays, etc...

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OK, after more than a year of living with this problem, and replacing the turn signal switch (which did _not_ fix the problem), and checking every bulb and every fuse multiple times, I finally broke down and turned my mechanic loose on this problem. He knew right away that it was a grounding issue. He didn't know where, but he hooked up an aux ground to the negative post on the battery and the problem went away. That diagnosed it, the solution turned out to be more difficult as he had to disconnect most of the ground wires connected to the chassis, and wire brush all the spots and then reconnect them all before he finally figured out which it was that was causing the problem. I told him I'd take all those apart again and grease them and then put them back together so they're more permanently fixed. He had seen this issue before, multiple times on GM vehicles. Now I know about it too, and I'm sharing it to hopefully save somebody else some grief.

Posted on Nov 09, 2010

  • esalazar04 Feb 19, 2011

    Im having this same exact problem with my tahoe!!! Like you, I've already changed out the turn signal switch and still have the same issues. i don't even know where to start looking for the ground wires.... i could really use your help to point me in the right direction.. thanks

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Do you have a trailer lighting plug on it??? If you do take it off and replace it...Its corroded.

Posted on Jan 14, 2009

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I would check any trailer lighting wires and any other after market wiring items you have in the rear of your truck..........it sounds like there is a short somewhere or a bad trailer wiring box. most of the newer gm trucks need an adapter to work with 4 wire trailer lights and it sounds like this is the problem

Posted on Jan 14, 2009

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You need to replace the turn signal switch, the contacts for the brakes and signals are close to each other and have most likely shorted together.

Posted on Jan 14, 2009

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