Brad Buchheister

Well I found a bad relay and now it's cranking but still no spark

Hey guys I have a 99 Kawasaki Prairie 300 4x2 that won't start. I bought it a few weeks ago. It was stolen at one point and went that got it back it was missing a few parts ( both racks, tail light, one headlight, CDI box, voltage regulator, 30 amp fuse, speedometer, pull cable, ignition coil). I have replaced most of the parts except the speedo, pull cable and headlight(on order) but I can't get it to turn over or spark. If I just the solenoid it turns over but still no spark. I check every connection there all good. I have traced every wire and nothing is missing. I even ordered a new full harness to make sure nothing was cut of the original and no broken wires. The only thing I can't figure out is there is a second four prong plug on the ECU that I'm not sure what goes there. Dose anyone no what this could be?