Re: 550 mca battery for my V6 200HP MERC
Ahoy, Bigkash.<br /><br />Before you blame your troubles on the battery, you need to confirm that the starter is getting enough voltage.<br /><br />With a DC voltmeter:<br /><br />Measure battery voltage when starter is engaged. It should not fall below about 9 volts. If it does, your battery is bad or too small.<br /><br />Measure voltage at starter (big lug to block) It should not be more than 1 volt below battery voltage when engaged.<br /><br />If the voltage getting to the starter is too low, your problem is in the wiring of the high current circuit, not the battery.<br /><br />Measure the voltage across EACH connection, including battery post to cable and solenoid. Each should measure less than .3 volts with starter engaged. If there is too much voltage, redo that connection.<br /><br />Good luck.
