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The left turn signal works off and on. When it works both…

Customer Question
The left turn signal...

The left turn signal works off and on. When it works both lights come on. When it doesn't work the blinking is faster and only the front light works. Replacing the rear bulb did not help.

Mechanic's Assistant: Have you checked the fuse?

No. I thought the whole system would stop if the fuse was blown.

Mechanic's Assistant: What is the model/year of your GMC?

2005

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Only changed the left rear bulb. Though it is a 2005 model it only has 115 k miles

Submitted: 8 months ago.Category: GMC
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Answered in 10 minutes by:
11/18/2017
GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago
GM Bob
GM Bob, ASE Master Technician
Category: GMC
Satisfied Customers: 1,231
Experience: 30 plus years experience as GM technician, ASE Master Technician and GM Certified
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Hello! My name is***** to JustAnswer.

Can you post your VIN?

If you use your hazard flasher does the left rear light work?

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Customer reply replied 8 months ago

VIN # is 1GKEC13T75R149893 When I turn on the hazard light the left rear does not blink. All of the other 3 hazard lights work

GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago

Do you have a test light?

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Customer reply replied 8 months ago
no
GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago

This may make it had to diagnose.

At the back under the truck there is a junction block.

Check the gray connector. Look for some corrosion on the terminals.

Do you have a trailer hook up?

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Customer reply replied 8 months ago
No trailer hookup. The grey junction block appears to have no corrosion on the terminals.
GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago

Need to get a test light to see if there is power back there.

Check all the connectors at the junction block

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Customer reply replied 8 months ago
How do you explain the intermittent perfect functioning of the left turn signal ?
GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago

A bad wire or connector will cause intermittent problems.

It may start working after checking the connectors?

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Customer reply replied 8 months ago
Thanks. Anything else to check ?
GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago

It could be a bad under hood fuse block. But you need to start at ether end with a test light.

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Customer reply replied 8 months ago
Thanks.
GMC Mechanic: GM Bob, ASE Master Technician replied 8 months ago

Let me know if you need more help.

Thank you

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