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Ask Dave Nova Your Own Question
Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19450
Experience:  ASE Master Certification. GM World Class Certification
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I have a 99 suburban that the turn signal fuse blows most

Customer Question

Customer: I have a 99 suburban that the turn signal fuse blows most every time I put in reverse
JA: Thanks. Can you give me any more details about your issue?
Customer: Turn signals work fine as long as I do not use reverse sometimes it will let me use reverse several times before fuse blows other times it blows right away
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Submitted: 11 months ago.
Category: Chevy
Customer: replied 11 months ago.
I squared away payment just waiting
Expert:  Dave Nova replied 11 months ago.

The turn signal fuse powers the reverse light circuit. The reverse switch is built into the transmission range switch on the side of the transmission. The light green wire coming out of the switch runs to the reverse lights. Since the problem is intermittent, it may be harder to track down. My suggestion is to inspect the wiring near the transmission, near both taillight assemblies, and at the trailer wiring harness (may be routed above spare tire). Look for any signs of pinched wires or chafing of the harness, particularly the light green wire.

Customer: replied 11 months ago.
ok thanks I will check that out. I just thought it odd to sometimes blow immediate and other times intermittent
Expert:  Dave Nova replied 11 months ago.

Harness is likely shifting around and shorting at some times and not at others. For that reason, looking at components that can move (transmission harness and trailer wiring harness) is where I would start the inspection.

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