ok,ive been thru 3 alts in the past 2 months.i just replaced it 3 days ago and its not keeping charge.im trying to see if i can get a little help.i need someone to explain how its supposed to be wired.its on a '65 f-100 352..anything helps.thanks Sean..

 

See if the wiring looks like one of these two diagrams. The first one is for an idiot light set-up and the second one is for a truck with an amp guage. The colors may not match, but these connections should work for your vehicle.