charging system warning light on 2003 GMC Savana 2500

I just replaced both the alternator and the battery. Now the charging system warning light continuously lights up for a few seconds the turns off while driving or idling. The voltage gauge reads 14 volts. I've driven the van several miles with the A/C and headamps on. The new alternator seems to keep the battery charged. With the engine off, the voltage gauge reads approx 12 volts. Any ideas as to why the charging light is doing what it does?

by in San Lorenzo, CA on April 02, 2011
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1 answer 2 comments
ANSWER by , April 02, 2011
After the vehicle is started how long does the light stay on?
COMMENT by , April 02, 2011
appox 10 seconds
COMMENT by , April 07, 2011
check how much amps the the alternator is putting out with a load on the battery ( lights on, radio on or ac on ) with that type of load it should produce about 60 amps . if it doesnt it will trigger the light on the dash to come on.