Thunderbolt IV Wiring Question
Hello folks! Just bought a 1993 Maxum 1900SR with 4.3L + Alpha One gen 2 and I'm going over general maintenance to make sure everything is in order since i don't know the history of how well it was taken care of. My next thing to do is check the timing at idle. Boat idles in nuetral fine at 650 RPM. So from what I've read about the Thunderbolt IV ignition, I don't have to use a jumper to check timing, just hook up the timing light, point and shot. However , i did find a purple and a Black (possibly gray) wire that is zip tied to the carb and not connected to anything. The end of the black (possibly gray) wire has a ring looking connector. The purple one has a plastic end that looks like it should snap to another connector. Long story story short, what do those do? I suspect the black/gray is the tachometer...? No idea what the purple one is. I'll try and post a photo when i get home. Thanks!