Join Date: Jul 2006
Location: Myrtle Beach Sc.
sounds like the alt is struggling to produce enough amps to power lights/ignition/ac/stereo/powerwindows and the fan (or fans) at the same time. What type of fans, what type of alt, ignition, accessories, and does this do this at idle or cruising speeds also? Also if there are other "hidden" issues with the cooling system (to small, t-stat going bad, slow fans etc) this amp draw problem could exacerbate the situation. Also, check your grounds. a bad ground could really slow things down. I have a 4 cyl conversion, holly ignition box, dual fans, and 3g alt, and when the a/c is running, the alt really struggles to keep up at idle. One time I had corrosion on my ground terminal (on the inside where the wire connects to the terminal out of eyesight). Cleaned the battery connection a ton, it always looked good. Took the terminal apart (I was going to replace the wire), found the corrosion, cleaned and put back together, problem solved!