I hooked up my battery today with a battery tender, cheap Wal-Mart type. In the manual for the charger and the manual for my bike it says to hook positive to positive and negative to a place on the chassis. When I do this I get no charge. I've tried many places within about 8 inches of the positive terminal. If I hook negative to negative on the battery it appears to charge. The manual for my bike says to hook negative to the foot peg but I don't have anywhere near enough cable. Any thoughts? What will it do if I keep it hooked to the negative on the battery?