Statefan15

My alternator went out a few days ago and I did everything I needed to as far as I know replacing it but for some reason my light on the dash stayed on. At first I figured it was just the battery charging back up properly and it would go off but after 2 days I'm lost as to why it's still on. All electronics are working properly and the battery gauge seems to be holding steady. Any help would be appreciated

techrep

iTrader: (1)

What brand of alt did you replace it with.. Our trucks are very picky with alts .. Have your checked your battery for proper connection and voltage ?

digitaltrucker

year make model? could be a bad alternator. Did you check for logged codes in the OBDII?

Statefan15

It was a duralast alternator and yes my battery is good sending out the correct voltage

Statefan15

2006 F150, I had my battery and alternator checked along with any other codes the truck may be throwing and everything seems fine. This is why I dont understand why the light is staying illuminated.

Browayjr

99% of the time when I put an alternator on and the light is still on its a bad alternator. It may be showing that it's charging with a voltmeter, but something inside the alt is not satisfying the pcm. Swapping it out is definitely worth the small amount of effort to confirm.

digitaltrucker

Agree, we had an Expedition that when you accelerated, the battery light came on, otherwise it was off. Alternator was bad.

ColdinCanada

Exactly right, the PCM is not seeing the proper operation even though the alt is doing is job. With our trucks, it's so easy to do I would swap it out for a different one (I've had great luck using a Napa reman) $240 CANADIAN