Question about 2004 GMC Sierra 1500 Crew Cab

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Same truck same exact problem

2004 GMC Sierra Z-71. When I use the left turn signal it turns the emergency flashers on. Right Turn signal works fine.

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The signal switch is going out

Posted on Jul 30, 2009

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I have replaced the flasher relay on my 2004 GMC Sierra but the hazard and signals still do nt work


Looking at the schematic diagram for the system(s), the flasher module is the first and only component common to the turn signals and hazard flashers, Unless the replacement module is bad, then there are only two possibilities: Both the Left and Right Turn Fuses in the left instrument panel fuse block are blown, or you have a ground problem from the flasher module.

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If the right side works it's not your flasher, Its your left side bulb, either front turn signal or rear tail light bulb.

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1 Answer

2004 gmc sierra left turn signal intermittently turns on flashers, new switch also does this?


Bad hazard switch. The power runs thru the hazard switch to the signal switch.

May 06, 2011 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

1997 gmc sierra extended cab - turn on the right turn signal and all of the lights go on but do not flash on and off and get a single buzz from the flasher unit. turn on the left turn signal and all works...


I would start by replacing the flasher, then if you still have a problem then check the bulbs for the rightside, make sure they all are good and the sockets are good, this sounds like a bad flasher.

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2004 GMC Yukon xl......If I put left turn signal on, the emergency lights flash. Found a burnt bulb for brake light and changed it. Problem persist. Emergency flasher switch still turns on flashers...


That vehicle has all three switches attached to the same module. Spray a little wd-40 into the flasher switch. Sometimes the slide on the flasher switch gets a little sticky and won't allow the turn signal to work independently. If that isn't the case, there is a repair kit for that available on ebay. the module of course costs around three hundred to replace but could possibly be found at a boneyard for much less. Also, check ebay for that module. Hopefully the WD-40 will fix it. Good luck.

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1 Answer

I have no right side turn signals on my 02 gmc sierra fuses are ok. all my lights work fine. just stoped working


try the turn signal flasher or it could be the turn signal wire harness in the sterring column

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1 Answer

2003 gmc 3500 series - turn signals and emerg. flashers not working


Would say its the flasher but they show seperate flashers for turn and hazard.Check fuses first.Both under the hood and in the cab.

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