Mustang no start

My 02 Mustang won’t start intermittently. The engine does NOT turn over and the battery works. I think it is a wiring issue, but don’t know where to look. It is a manual transmission, and I’m not sure that there may be a sensor in the clutch pedal that makes the car think the pedal isn’t pushed in. Any help/suggestions would be appreciated.

What engine? Define “turn over”.

Could be an issue with the PATS key . Also the clutch needs to be fully engaged for the engine to start, the sensor could be bad.