GMC 12694626 Starter Assembly, .

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First, disconnect the cable from the negative battery terminal. On 6.0L models, loosen the wheel lug nuts for the right front wheel. On all models, raise the front of the vehicle and place it securely on jackstands. On 6.0L models, remove the right front wheel. Remove any skid plates, if equipped, to allow access to the starter. On non-6.0L models with 4WD, remove the right front differential carrier bracket under the starter, if equipped. On 6.0L models, remove the right front wheel well splash shield. On all models, remove the starter heat shield, if equipped. To remove the heat shield from the starter, simply pull it off. Disconnect the battery cable and the starter control cable from the starter solenoid terminals. If you're unable to remove the nuts that secure the starter cable and starter control cable nuts with the starter bolted in place, skip this step for now, then remove the nuts and disconnect the two electrical cables after the starter has been unbolted. On 6.0L models, remove the transmission cover bolt. On all models, remove the starter mounting bolts and remove the starter. You can remove the starter from underneath the vehicle on non-6.0L models. On 6.0L models, remove the starter through the right wheel well opening. Installation is the reverse of removal. Be sure to tighten the starter mounting bolts.

For 4.3L V6 (2018 and later), 4.8L, 5.3L, and 6.0L V8 engines, the steps to remove the starter motor include:Removing the right bellhousing cover retaining bolt.Repositioning the engine oil cooler if necessary.Removing the starter motor mounting bolts.Disconnecting the electrical connector from the oil level sensor.Moving the starter motor toward the front of the vehicle until it clears the transmission bellhousing while supporting it to prevent damage.

If the starter does not engage when the ignition switch is turned to the start position and there's no battery voltage at the starter solenoid's positive terminal, you should investigate further. Connect a 12-volt test light or voltmeter and have an assistant turn the ignition switch to start. Lack of voltage points to issues in the fuses or starter relay within the starting system.