went to leave a job, car wouldn't start. got someone to jump it for me, somehow it just shut off before i got in and left. tried jumping again...nothing! took starter off, tested it(az) toast, got a new one, replaced it... just clicks at starter. checked relays/fuses...nothing is blown. what are my options now? i have a meter to check, but not sure exactly what or how to check anything else besides the battery.