Classic flickering lights issue, cannot figure out. - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-08 SS General Tech Q&A > General

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Old 02-08-2018, 12:31 PM
Iron Indian Iron Indian is offline
Junior Member
2007 Chevy TrailBlazer SS (3SS)
Bordeaux Red Metallic 6.0L LS2 V8 2WD
Join Date: Feb 2018
Location: Oklahoma City, Oklahoma
Posts: 1
Classic flickering lights issue, cannot figure out.

Iíve owned my TBSS since it was practically new and in the last year Iíve notice I have the flickering light issues many have had in the past. Iíve been doing research on old threads it seems like NO ONE has ever figured out a direct cause. The best answer I got was a new fresh battery got rid of the issue. When the batttery gets older the problem generally can come back. Thereís surely more to it than that?

So far what Iíve done...

-swapped alternators twice with Reman Ultimas from OReillys
-Swapped in a new Duracell AGM battery from Sams
-installed, removed, reinstalled PCMofNC 3 wire upgrade.
-checked grounds.
-my TBSS has NEVER been wrecked

What has actually worked for people who have had this issue?

BTW, I donít have a Cam or a stereo. Only electrical mods I have...

PCMofNC 3 relay Spal electric e-fans, Magnuson Intercooler Pump, Devilsown Alky Injection Kit, Aeroforce Gauge, AEM wideband, Boost gauge lighting.

Surely Iím not due for a bigger alternator?

Sent from my iPhone using Tapatalk
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Old 02-19-2018, 12:05 PM
supersport777 supersport777 is offline
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Black GMC Envoy Denali
Carbon Black Metallic 5.3L V8 2WD
Join Date: Nov 2017
Location: Long Beach, CA
Posts: 17
Maybe go for a new alternator instead of a reman unit?
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Old 02-19-2018, 03:20 PM
drcscruggs's Avatar
drcscruggs drcscruggs is offline
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2005 Chevy TrailBlazer LS EXT
Summit White 5.3L V8 4X4
Join Date: Aug 2017
Location: Galveston, Tx
Posts: 80
before buying yet another alternator, I would see what the voltage is with a voltmeter. Also is it fluctuating or steady. If it is putting out 14v (about) and steady, I would rather doubt it was the alternator. As far as a diagnosis, I am not able to advise much. I might check out the cables to the battery. At the battery AND at their respective connections. Sometimes, (I have had this happen), the cables go bad and this leads to intermittent issues. BEST
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