can you check the battery w/ a volt meter?
one w/ the car off (i think it should be low 12s)
one w/ the car running.(i think this should be mid 13s)
check if the battery also hold a charge to rule out if its the battery or the alternator.
4.10 Gears, 10inch 3500 stall, Jmod, True dual, ASP pulley, Ford B springs + tokico blue, MM XL subframe, SCT Bama...
Collecting Parts for a Windstar kit