I have an 86 IROC that has a 2-wire alt. I changed to a 91 set/up, the 91 has a 3-wire alt. I need to know how to go from a 2-wire to a 3-wire plug.
thanks, joe

 

can u use the old alt just swap he pulleys or are the mounting brackets different?

 

the way it mounts is totaly different.

 

the 3 wires on the 91 style alternator are as follows:
RED(or black)---goes to battery+
RED-------goes to starter
brown---goes to Fan fuse in fuel panel.

the alternator grounds itself by the case once you mount it


I do not know how the wires are on your cars factory setup.

I remember seeing an adapter harness for this setup on the net somewhere

 

thank you for info. my factory alt. has a red, and green wire, and a bigger red wire that went from back of alt. to bat. I will look for an adaptor for this app. thanks, joe

 

if you cant get the wiring straightened out, then try to see if you can swap out the guts from one to the other.