I'm running a 3-wire alternator in my '87. The charging system went out on me a few days ago and I'm starting to look into it now. I'm going to check continuity on the fusible link spade wire tomorrow am. Anything obvious I should check? I don't see a voltage regulator in the wiring diagram, should there be one on this vintage truck? Also, any recommendations on replacement alternators should I have to purchase one?