Electrical Repair Questions? Ask an Electrician for Answers ASAP
Do you have a multimeter to check 12 volt output from starter motor contactor? This is the most likely cause now, that or a defective/jammed starter motor.
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I agree, it was a loose connection somewhere or a failing starter solenoid.
Home Depot sells a digital test meter for about $23, it would be a good investment around the home.