The wiring diagram is available on www.theepicenter.com as well--its easy to hok up a GM altenator though,you just run a 12V hot wire from the ignition,hot only when the key is "on",to the #1 terminal,and you put a #194 marker lamp bulb in line to that terminal,and you just jump the #2 terminal to the stud on the rear of the altenator (the main output) and its done..the rest is just fabbing up a suitable mounting bracket..I find one off an old 250 straight six is easily adaptable to most inline tractor engines and small HP engines..