Hello everyone, I am trying to help a friend with his 1998 Cadillac Deville after the alternator completely stopped charging and left him stranded. I thought it was going to need an alternator, but I just checked it out and found that neither of the two wires on the alternator's plug have power with the key on or with the engine running. I was expecting one of the wires to be the signal to turn the alternator on when the ignition is on and light a test light like on the other cars I have worked on, but neither wire has any power. Unfortunately I have not been able to find much information on the wiring, the only diagram I found is this one. From what I can tell, the grey wire (F terminal) is just to tell the PCM what the alternator is doing and the red wire (L terminal) is for the battery light. So which wire tells the alternator to turn on? Is it just activated through the battery light? I have never been so confused by an alternator wiring diagram.
Thanks in advance for any help, it is greatly appreciated!
Thanks in advance for any help, it is greatly appreciated!