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2008 Trailblazer LT 4.2 110K miles has lights flickering…

Customer Question
2008 Trailblazer LT 4.2...

2008 Trailblazer LT 4.2 110K miles has lights flickering while driving (dashboard and headlights)

Mechanic's Assistant: Have you checked the fuses? The dashboard bulbs?

Yes - removed fuses and visually inspected all and reseated fuses (did not replace with new)

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

I am hoping to fix myself - depends on the issue. So far removed and cleaned battery cabling, tested battery, checked all fuses

Submitted: 7 months ago.Category: Chevy
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Answered in 2 minutes by:
12/18/2017
Chevy Mechanic: Ron, ASE Certified Technician replied 7 months ago
Ron
Ron, ASE Certified Technician
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Satisfied Customers: 38,578
Experience: 35 years experience with ASE Certs
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Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

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Chevy Mechanic: Ron, ASE Certified Technician replied 7 months ago

If you connect a voltmeter to the battery with the engine running while the lights are flickering does the voltage also fluxuate?

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Customer reply replied 7 months ago
I only notice the flickering while I am driving - have not noticed it at idle where I can watch the voltmeter
Chevy Mechanic: Ron, ASE Certified Technician replied 7 months ago

The common cause for this type of problem is in most cases a bad alternator and it can be checked at the battery, if the voltage is also fluctuating. I suspect that is the problem you are dealing with here as well.

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