Mercury G2MZ-11002-BD Starter Motor Assembly

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Check the starter cranking voltage and the current draw from the battery. This test must be performed with the starter assembly on the engine. Crank the engine over for 10 seconds or less and observe the battery voltage; it should not drop below 8.0 volts on manual transaxle models or 8.5 volts on automatic transaxle models. Also, observe the current draw using an amp meter; it should not exceed 400 amps or drop below 250 amps.

Disconnect the cable from the negative battery terminal.

The battery cables might overheat due to the large amount of current being drawn from the battery. Discontinue testing until the starting system has cooled down. If the starter motor cranking amp values are not within the correct range, replace it with a new unit. Ensure the battery is in good condition, the cold-cranking rating is adequate, and that the battery terminals and cables are clean and not corroded. In extreme cold temperatures, warm the battery or engine block before performing tests.

No, it's not necessary, but detaching the center bearing support bracket will provide enough room to remove the starter.