Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

GMC Sonoma - left turn signal and real tail lights (not brake) are possessed


Recommended Posts

Would love it if someone can help me with this. I've been at it for hours.

 

2003 GMC Sonoma single cab.

Wife is driving it and suddenly two things happen:

left turn signal is always on, won't blink

tail lights (not the brake lights) won't turn off.

 

So I check fuses and replace the combo switch.

that's not it. So I remove the new switch. Tighten the junction box back up.

 

And - voila - it works. NFI why.

 

Then, 2 hours later, without anyone touching the truck, the tail lights are back on.

 

Replace the turn signal flasher.

 

Everything works! Tail lights and turn signals!

For exactly 20 seconds.

 

Now the tail lights are back on, and the left turn signal half blinks - it's always on, but when it should be blinking off it blinks to half strength.

 

I can't set the truck on fire. I've thought of it, but it's not mine.

How is it that turn signal wire and tail light wire are shorted together? where is that turn signal getting power from? wtf happened?

 

I like problems with big chunks of metal, not thin strands of copper.

Link to post
Share on other sites

Have you checked the ball switch located in rear by the main connection junction? If this goes out, it will cause tail lights to malfunction. Also check your ground clscrews where lights are attached. If those are corroded or busted off it will cause symptoms your getting.

  There are youtube videos that show you where they are at.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.