Engine Cranks Slowly for GMC Truck TopKick C-Series (Conventional) C4/C5 2007

Perform the following checks:

•	Battery--Battery Inspection/Test. Refer to Battery Inspection/Test .

•	Wiring--Inspect the wiring for damage. Inspect all connections to the starter motor, solenoid, battery, and all ground connections. Refer to Circuit Testing , Wiring Repairs , Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

•	Engine -- Make sure the engine is not seized. Refer to Symptoms - Engine Mechanical for the 8.1L engine, CAT® or the Isuzu Unit Repair Manual for Engine Mechanical.

If the battery, the wiring and the engine are functioning properly and the engine continues to crank slowly, replace the starter motor. Refer to Starter Motor Replacement , CAT® or the Isuzu Unit Repair Manual for Engine Mechanical.