Flickering Lights - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1Low76jimmy · 05-08-2004, 02:34 AM

Whats does it mean when I'm at a Stop/Idle my Headlights & Interior Lights Flicker in my 1985 Suburban. Do I need a Better/New Alternator???

NeCrOmAnCeR · 05-09-2004, 11:00 AM

At idle, this may happen. Alternators (especilly high amperage ones) are not very efficient at low speeds. If the charging system works normally otherwise I would not be concerned. If it is too annoying, try a replacement. My voltage also drops at idle with lights, A/C, etc turned on.
The flicker is caused by the regulator trying to increase the alternator output.

05-08-2004, 02:34 AM	#1
1Low76jimmy Registered User Join Date: Jul 2001 Location: Fairfield, Ca Posts: 68	Flickering Lights Whats does it mean when I'm at a Stop/Idle my Headlights & Interior Lights Flicker in my 1985 Suburban. Do I need a Better/New Alternator???

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05-09-2004, 11:00 AM	#2
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	At idle, this may happen. Alternators (especilly high amperage ones) are not very efficient at low speeds. If the charging system works normally otherwise I would not be concerned. If it is too annoying, try a replacement. My voltage also drops at idle with lights, A/C, etc turned on. The flicker is caused by the regulator trying to increase the alternator output.



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