Originally Posted by 56dodge
hey guys. well recently replaced alternator on engine was a one wire alternator which also had another smaller red wire that ran somewhere else to the car/engine both wires were from the one output in the alternator. now the new alternator is a two wire. the one positive terminal and another output with is black and am assuming is a ground that I have nothing connected to. I changed the older alt. because it was overcharging, now the new one is not charging or is draining the batt. I have been looking into it and have read of a field wire? is this what I need? Is there anything I have to change now that the alt. has two connections? why was the first alt. doing fine before it overcharged without a field wire?
both alts are from an 85 camaro 305 ohv
If you want help, more information is needed. Do you know what style alternator you have.
If it is a 10SI the large stud on the back will be directly connected to the battery positive through a jusction somewhere.
The #1 wire should be hot and fed through the dash light or a resistor of approximatly 35 OHMS, the #2 wire is the sense wire and should be connected to a hot lead near the fuse box. Some people will just jump this to the stud on the back of the alternator but it is not optimal.