The key switch must be in the OFF position.
The battery must be at full charge.
The cable connections on the battery must be clean and tight.
Connect a jumper wire between S terminal and BAT terminal [Figure 50-40-1].
If the starter turns but does not turn the engine, the starter drive has a defect.
Connect a jumper wire (of at least 4 gauge in size) between the M terminal and the BAT terminal [Figure 50-40-2].
If the starter turns, the defect is in the solenoid.
If the starter does not turn, the starter is defective.