GMC 12637617 Starter Asm

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First of all, you need to disconnect the starter motor cable from the negative battery terminal; then on V8 models you will have to loosen the right front wheel lug nuts and raise the front part of your car using jackstands. For V6 models remove oil pan skid plate in case it is equipped and on V8 models as well remove right front wheel well splash shield. Remove if applicable a starter motor heat shield respectively and separate starter control cable and battery cable from starter motor solenoid terminals. On V8 models take off transmission cover, finally unscrew the mounting bolts of a starting engine. To install a new starter, just reverse the order of these steps ensuring that bolts are tightened according to specifications for torque.

Raise the vehicle and support it securely on jackstands.

When suspecting a malfunction in the starting circuit, it's essential not to immediately attribute it to a faulty starter. Instead, perform a systematic inspection of various components and connections to identify the root cause. This is because several factors other than the starter can contribute to starting issues, and diagnosing the actual problem is crucial.

During the installation of the starter motor for 4.3L V6 (2018 and later), 4.8L, 5.3L, and 6.0L V8 engines, you should proceed with the installation in reverse order, ensuring that the starter motor mounting bolts are tightened to the specified torque.

If the starter turns over slowly, the following steps should be taken: 1. Check the starter cranking voltage. 2. Check the current drawn from the battery. 3. If the starter cranking amp values are not within the correct range, replace the starter with a new unit.

If the starter turns over slowly, the following steps should be taken: 1. Check the starter cranking voltage. 2. Check the current drawn from the battery. 3. If the starter cranking amp values are not within the correct range, replace the starter with a new unit.

Remove the transmission cover.

If the starter is receiving voltage but does not activate, the following steps should be taken: 1. Remove and check the starter/solenoid assembly on the bench. 2. Ensure that the engine is not seized. 3. If the solenoid plunger extends and rotates the pinion drive, the starter/solenoid assembly is working properly.

Remove the starter motor mounting bolts and remove the starter motor.

If the starter turns over slowly, the following steps should be taken: 1. Check the starter cranking voltage. 2. Check the current drawn from the battery. 3. If the starter cranking amp values are not within the correct range, replace the starter with a new unit.