my 2015 4CSE is blocked behind my stalled 92 spider veloce with a spark problem. Cranks but no spark. It has been super reliable in the past. I changed original plug wires and coil out with no luck. I used continuity light and found out no power to distributor. Relay or ECU? I can not drive either until I fix the electrical problem for the 92. Anyone know where I can find a wiring diagram to trace the source?