MED alarm wire Diagram needed for Diablo

Can anybody help me with a diagram or schematic on the MED Alarm system , What I need to know is what wires do what going into the black box, I could buy a new box and Remote for $ 1K + , but I really want to make sure thats the problem ( Besides I don`t have $ 1K right now either cash or credit ) , If I knew 2 wires do the fuel shut off , + 2 wires do the Starter circuit , I could work with that , If I find out there is no starter circuit, Thats what I need to know because then my problem is elsewhere on the intermitten cranking problem I have .Has anybody repaired the MED alarm system or Access to the info I need? Thanks