Electrical/Wiring Issue - Need Help!
Hello all! I would appreciate some expert advice because I am new to motorcycles. I bought a 2005 ex 500 about a month ago with only 5000 miles. It had obviously been laid over at some point, but the owner said that he had bough it from a dealer who said the only problem was bad. After that, I proceeded to make the mistake of letting my diesel mechanic roommate convince me that it was a problem with the starter, which lead to a whole bunch of other problems (pulled the starter out, causing the gear on the flywheel chain to slip off, requiring us to drain the oil and open the flywheel cover, which meant we needed a new gasket, etc.), before we finally replaced the right part and got everything put back together.
Theoretically, the bike should have worked at this point, but the engine still wouldn't turn over (the starter motor did run though). I called my roommate out again and he figured that the pistons had just gotten sticky while the bike sat in storage. His recommendation was to get some starter fluid. So I ran to the nearest gas station to grab some starter fluid. While I was gone, my roommate tried to start my bike. He won't be touching it again anytime soon. I wasn't there, but this is what he claims happened:
The seat was off of the bike. He was running the starter motor on and off, letting it cool down before he tried to start it again. He says that the engine turned over, ran for about two seconds, then died. At the same time that the engine died, the negative terminal on the battery started sparking. He got the wires disconnected from the battery before anything caught on fire. The negative wire was hottest, but the starter solenoid and positive wire were also warm. By this time I was back. Any attempt to reconnect the wires to the battery terminals caused sparking on the negative terminal. All the fuses are fine, so I assume that a wire connection or switch shorted out somewhere.
I need to get a multimeter so I can check for current to try and find the short, but if y'all have any recommendations on where to start looking I would greatly appreciate them!