GMC 12645298 Starter Asm

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Detach the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Remove the front bank catalytic converter. Remove the starter heat shield mounting fastener, then remove the heat shield. Disconnect the wiring from the starter. Unscrew the starter mounting bolts and remove the starter. Installation is the reverse of removal. Tighten the starter mounting bolts securely, then reconnect the cable to the negative terminal of the battery.

Detach the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. On 2.4L engine models, remove the power brake booster pump fasteners and secure the pump out of the way. If you're working on 3.0L and 3.6L models, remove the front catalytic converter. Disconnect the wiring from the starter. Remove the torque converter cover, then unscrew the starter mounting bolts and remove the starter. Installation is the reverse of removal. Be sure to tighten the starter mounting bolts securely, then reconnect the cable to the negative terminal of the battery.

If trouble occurs in the starting circuit, don't just assume that the starter is to blame right away. The following are to be checked first: ensure clean and secure battery cable clamps on battery, replace any suspect battery cables among them, test battery condition, look at starter solenoid wiring and connections, check for tightness of starter mounting bolts, verify transmission position (PARK or NEUTRAL for automatic transaxles or clutch pedal pressed for manual transaxles), and evaluate Transmission Range (TR) switch adjustment. When the ignition switch is turned to START and the starter does not operate, test for battery voltage to the solenoid by hooking up a test light or voltmeter with an assistant turning the ignition switch to START. If no voltage is present, inspect the starting system circuit. If there is voltage but the starter does not engage, remove it from engine compartment and bench test. Thus where a slow turn over of a starter is encountered, evaluate the starter cranking voltage and battery current draw while comparing those values with specified ones; if they do not meet these values replace it while also looking at condition of battery as well as cold-cranking rating. Last of all if a starter receives voltage but doesn't activate it should be removed and inspected on bench in order to examine operation of solenoid; also viewing its components along with those of a starter.

Lighten the starter mounting bolts securely.

The nut should be removed and the battery cable should be disconnected from the B+ terminal.