I am doing a v6 to v8 swap and the alternator
on the car has a two prong plug and the new
alternator has a four prong plug. How do I wire the new alternator to the car. The old
alt. is to big to fit in the bracket for the
serpentine setup.

 

maybe i don't understand something, but why are you swapping altenators?

 

What are the years of the V6 & V8 systems you are swapping?

Tim

 

The old alternator came off a 1978 GMC JIMMY so did the motor but the one on
the car with a v6 is the same. I just got a serpentine setup for the car at
a good price and it all fits except for the plug on the new alternator. Do
they make an alternator the same size with a 2 prong plug.

 

The v6 was a 1985 and the v8 is 1978 I just got a serpentine setup for a
good price and it all fits except for the plug on the alternator is
different and the alt on the car and the one from the motor are the same but
will not fit on the serpentine set up they are to big.

 

no chance of simply swapping the pulley onto the old altenator and using your usual 2 plug?
you can go to most auto-parts stores and get a new plug and about 8" wire for each connection already for wiring up, and the schematic looks something like what is described on this thread...read AND look at diagram on here. https://www.thirdgen.org/messgboard/...ML/000104.html

 

THANKS FOR THE SCHEMATIC BUT WHEN I CUT THE 2 PRONG PLUG WHICH PIN DOSE THE SMALL WIRE HOOK UP TO B,S,F,L. THIS WILL HELP ME ALOT BECAUSE I AM NOT VERY GOOD WHEN IT COMES TO WIREING!!!!!!

 

The very large wire coming directly from the battery goes to the large threaded lug on the rear of the alternator. The large diameter red wire in the plug, which connects to a fusible link at the large lug on the starter, connects to terminal S. The brown wire, which comes from a "hot in run" fuse in the fuse block goes to terminal F.

Tim