I've been trying to hunt down the problem that plague my mustang. My car when I try to start it seems not to have enough juice to turn it over. So I brought my optima back and got a need one. Still did the samething. I replaced the starter and still did the samething. The battery gauge says it's charging and the battery is ok. I'm losing my mind. I have a TDC turbo kit and everything is relocated. I cleaned the ground some connections by the fuse box under the hood. I was wondering if it's the starter relay, or igition switch, or maybe my motor is shot and the starter can't turn it over. lol Please leave some info on anything it's driving me nuts. Thanks