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Re: disconnecting battery while engine is running
Yes, with the ignition on and high idle you can blow relays, radio and other electrical equipment. You need the battery to absorb amperage and voltage spikes. Some say this is a test to see if the alternator is charging. Instead, measure voltage at the battery while the engine is running. Should be about 13.8 volts. Don't test your alternator by disconnecting the battery.
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