Ski came in , no start , not cranking over, I put in a fresh battery , nothing , checked the voltage at the main fuse 3.4 V , not good , the customer said he could push or pull on the positive cable and get it to crank , tried all that nothing happening , so I pulled the top off the ski to access the starter solenoid and wiring , everything looked good , nothing loose or damaged , I did my redneck test which is bypass the ground wire with a jumper cable, ski cranked and ran . If bypassing the ground doesn't work then bypass the positive cable the same way.
Next I cut the cable end off and held the bare wire to the neg post, nothing , that's when I heard it, kind of pop - crackle and I knew exactly what it was , the ground cable was loose at the starter , the issue here is you can't get to the starter on these without pulling the exhaust. , Usually you can pull the rear half which is fairly easy , did that bolt felt tight cable was flopping around.
So I pulled the rest of the exhaust out of the ski where I could get to the bolt because it wasn't coming out easily and I was afraid it would break off , I got it out a few turns and with some penetrating oil, a few cuss words and a lot of working the bolt back and forth it finally came out , some idiot had put a damaged bolt in there and then just cranked it down, yes it felt tight but it didn't bottom against the cable and the starter , so I broke out the tap , tapped the threads and put a new bolt and neg cable on it, now I just have to put everything back together.
So yeah if it looks like it exploded , yeah that's pretty much what happened .