I have a 1996 force 120. When I turn the ignition to start, the starter engages the flywheel, but doesn't seem to have enough power to turn the motor. Both batteries are brand new, I have cleaned and tightened all of the connections, but still no start. The ammeter drops to zero when the starter is engaged. The starter gets hot when I try to start the motor. I have been told that the only two things that will cause this are low batteries, or a bad connection. Can anyone give me any ideas?