Okay so I have already built my truck and I'm looking at getting a new alternator because my old one's pulley is egg shaped, squeaks and is the wrong one for my motor swap, the 3rd hole doesn't line up so I used a long bolt and washers to fashion it down which I'd like to get rid of and put the alternator on the motor which belongs there so it can be properly secured... Here is my motor swap http://www.explorerforum.com/forums...c-iv-ranger-99-sohc-swap-a4ld-to-m5od.455641/ So I have a 99 4.0 sohc with a 90 alternator bolted to the motor, all being ran by the 1990 eec-iv computer. I've done several searches to find the wiring diagram and pin outs for a 1990 ranger 4.0 charging system and I can only happen to find 86-89 and 91-94. I do not own a Haynes manual and currently can't afford one but I assume that's where I could find the info I'm looking for possibly, any help? When I first did the engine swap I saw the alternator plugs were quite different and I hardly remember but I think there was a different amount of wires on both the 90 compared to the 99 so anyone who can help me figure this out will be helping me give more info to those performing a sohc swap in their early model fords just like mine. To this point I haven't yet searched for the 99 wiring diagram but just the fact I can't find the 1990 diagram has got me upset enough to ask for help.