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What happens when the car does not want to start?
Does it turn and crank?
Do you have a voltmeter or something to check voltage?
Yeah I kind of figure the voltage is there, since it turns if you leave it for a couple of days.
You will need to measure the voltage at the starter. Put a voltmeter at the starter and see if there is 12v at the starter when the key is turned. If 12v is at the starter, but the car does not crank the starter has gone bad. If 12v the ignition switch is going bad.