Ok so we just got this 1988 SeaDoo Bombardier SI from a friend of ours. So far it has cost us nothing. The motor isn't locked up, the guys tried starting it and it turned over but the battery's dead. So he took the battery out, for some reason. Well, I've figured out what battery I need but where does the battery go? There's a white plastic box with 6 wires, 3 on each side, opened that up and that's just electrical stuff. I don't see any wires just laying around that would hook to the battery and I can't find a diagram online.