I am trying to sort the wiring harness at the alternator connections. I have five wires that terminate near the alternator . the ground ,the power a purple and a small red. My question relates to the fifth wire . It is purple with a white strip and has a connection boot on it . There are no other sending units that i can see that this wire would connect to and there is a stud on the altnernator that appears to be a receptical stud . Is this wire an altnernator wire or a gauge or swnding unit wire of some sort.

Thanks Rick G..

Need more info on what engine, power on so

605 cu in bow tie block merlin hrads dart intake MSD ignition. Looks to be a standard Merc wiring harness . What more do you need to know .
Looking for any help I can get.

Thx Rick G.

The alternator...is it a Mando, Delco, etc.?

Isn't there a thick orange wire in that harness?