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if the battery is good it is NOT the alternator. the alternator charges the battery, if it won`t start with a new battery the alternator does nothing to affect the situation. check voltages at the starter motor connections for proper voltages even the wires that the ignition switch supplies power to. if you have proper voltages at the starter you can try hitting the starter while someone tries to start the car. if it starts the starter is worn internally and will have to be replaced.
Hi Vernon, There could be a number of different reasons why your vehicle is failing to start. The battery voltage could be dropping during start and become unable to engage the starter motor to turn the engine. You can check this by trying the key with the head lights switched on. If the lights become very dim, you'll need to check the battery, meaning clean the terminals and then try to start with a jump from another battery. If you achieve start up and it fails again the following morning, you will probably need to replace the battery. There could be a problem with the starter relay or a loose contact for the starter motor, most lik3ely the one connecting to the soliniod. It would be good to know some additional information, such as does a clicking sound come from the starter when engaged? Is there a perceptible drop in voltage output when the starter is engaged? does the enine turn at all? Try what I've suggested and if that does not solve the problem answer the questions and let me know anything else which you may think is relevant. Regards John
If your starter won't turn over after driving and shutting the car off, sometimes, it sounds like your starter is getting stuck/overheating. Replace your starter and this problem should go away.
Check the continuity of your power cables leading from the battery to the starter as well as the lines from the ignition switch. You could have a faulty connection or a bad switch.
the ignition maybe bad are the car is not all the way in park also check the battery to make sure it has a good charge and it does not have a bad cell in it and the terminals are clean.
Voltage drop testing the starter electrical circuit would be a good first step , ruling out the cable's connections an ground ! Starter Voltage Drop If this doesn't find a problem ,then check the control side . Ignition switch , when it won't start check for Battery voltage at the connection at the starter solenoid "S" terminal . How to voltage drop test starter motor circuit
Lots of Issues with Ignition switches. Car will not crank due to incorrect pass lock voltage to BCM.Most Likely Has A DTC B2960,B3033 Stored in BCM Most likely need another Ignition switch..Good Luck
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