what are the possible causes of lights flickering on my vehicle. the interior lights and headlights pulsate when i first start the car and then gradually stops. all electrical components and systems operate fine but the power seats make a clicking sound when functioned. battery is charging and in fair condition. any suggestions?
lights flickering on 2003 Toyota Avalon
by AAJAY in Virginia Beach, VA on July 19, 2009
ANSWER by patrick mannion on July 19, 2009
The battery has been charged and tested under load (using a high rate discharge tester and battery hydrometer)? Ensure the battery connections are clean secure and tight. Put a volt meter across the battery at rest it should read 12.6 volts, get a friend to start the car, the voltmeter should instantly read approximately 14.6 volts. I suspect the alternator may be failing. Does the battery light come on brightly when the ignition key is turned on and go out immediately when the engine starts.
ANSWER by Visitor on June 25, 2010
A weak battery will cause the flicker. Mine did the same thing until I replaced the battery. That was at the 6+ year mark. Not bad for an original battery.
Had alternator rebuilt and put back in but light went back on and dash lights flicker. Is there something else I can check that may cause the problem?
V6, Charge of battery at rest: 12.6V, after car starts: 13.75V, new battery, I suspect the connection cable connections to the battery are bad.