When I slow down at a light our to stop, the lights dim like every light in the car same with the heater blower then when I hit the gas to go they brighten up again, same with the blower motor it speeds up again, but I just put a new battery in like week ago so i that maybe the altenator our some thing but i am not sure, I thought maybe bad ground

what is your chargeing output??

It'* been discussed here beforew, and it'* normal. Apparntly, GM uses alternators that just cover the needs of the car....

Well, if it is night, with the blower running, headlights on, wipers going that is a TON of draw to put on an electrical system and I have seen cars from all makes do it. HOWEVER, I have seen this problem at its worst when cheap reman alternators are used. If you want a stock replacement I would recemond an AC Delco rated at the highest for your car.


Jay

i have a 140 amp AC Delco and i can run at night with the heat on High, headlights on, 15 interior neons, one underbody kit, grille neons, angle eye fogs, and the radio blasting, and the battery gague is about 12.5. On a normal day without all that crap on the battery gague is only like 13, but reads 14.1-14.2 coming off of the battery

Ya i probably need a better alternator Because I have a pretty hard stereo, but beside that I can probably get on for awhile couple months. But I am not sure what size it is how do you check just wondering it looks like it might have been changed awhile ago but i am not sure just got the car last year so. And how much would a 140 amp AC Delco alternator cost.

I think that my 140 was like $80 something from Advance with lifetime warrenty

Pull That alt out and there should be a stamping on it with the amperage.