A friend just bought a 1988 yamaha. I'm the designated mechanic. I need to familiarize myself with this cart. Right now it won't start. When she turns the key and hits the accelerator there is a selenoid like clicking. I had her put a charger on the battery overnight but it still only clicks. I'll stop by to look at it in a day or two. I'm a retired auto mechanic with a full set of snap on tools and lots of test equipment. Any basic suggestions for one of these. Does the generator/starter work by reversing the polarity? Any other quirky things handy to know about these? We're a two day drive south of the border in Mexico so we need to do most repairs ourselves or make do. Back to basics. Thanks for any help.