Starter Draw Test - 28-MT Starter Motor

TOOLS REQUIRED:
J 39200 Digital Multimeter
J 35590 Current Clamp

Important: Verify that both batteries are in good condition.

NOTICE: Never operate the starter motor more than 15 seconds at a time without pausing to allow it to cool for at least 2 minutes. Overheating will damage the starter motor.

1. Disable the fuel system by removing the fuel solenoid fuse.
2. Calculate the current draw, and select the 200 A or 2000 A scale on the current clamp.

Starter Draw Test:

3. Zero the current clamp, and clamp the tool to the negative battery cable.
4. Crank the engine and observe the meter readings. The reading should be 330 to 360 amps. If the amperage is over 360 amps, an internal starter failure may be the cause. If the amperage is under 330 amps, a battery cable or connection may be the cause.