Another one of our properties sent me this cart to look over. Found all battery cables in bad shape. Some with no lugs at all on the cables. Batteries seem to be good. All reading 8.3v - 8.4v. As far as I can see, all is good in the battery compartment. After a half hour it starts to jerk with battery light on. Will not go, just jerks. Could this be that the motor runs when cold and then jerks when it gets hot?