Sounds like it might be a bad battery or corroded battery terminals. Try cleaning terminals and battery posts and check the battery by putting a voltmeter across the posts (not terminals) and read the voltage when attempting to crank the engine with the starter. If the voltage drops to few volts, the battery is bad. If battery seems OK, try the voltmeter across the terminals attached to the wires and try the cranking test again. If the voltage drops now, there is corrosion between the posts and the terminals.


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