my bro has a 1995 cat 580 efi with no spark. We tested coil, the ignition sensor on the crank, used a different cdi, tried a different computer with matched injectors, the stator was replaced before he bought it, and tested the kill switch, key switch, cleaned the grounds. the computer blinks once like it should and the pump runs but still no spark. any ideas would help greatly. rectifier/regulator? wiring harness? the stuff we could ohm was within specs.