i need to know how you wire a 90 mustang internally regulated alternator, into an externally regulated 85 t bird harness, if it's even possible. any tips at all will be a major step in the right direction. thanks
I don't believe the 90 Mustangs used an internally regulated alternator. Is the alternator you have a 3g alternator ? Maybe you could post a pic of the new alternator and then we can help you figure out which wiring setup you will need.