I have a 1990 760 GLE that I'm experiencing an off and on starting problem with. The battery is brand new, so I know that isn't the problem. I get in the carand turn the key and get nothing but a click. I jump the car and that solves the problem. Then it will start normally, I just never know when it's going to happen. I take m chances everytime I go anywhere. I'm thinking it's maybe a loose wire in the starter or something wrong with the ignition. Anyone have any ideas?

Thanks!