Preliminary Tests

1999 GMC Forward Control 5.7 R, AutomaticSECTION Preliminary Tests
NOTE: PG260 starter motor is not serviceable, and must be replaced as a complete assembly. If test values do not meet specifications, replace starter and solenoid as an assembly.

Remove starter from vehicle. See STARTER  under REMOVAL & INSTALLATION. Check starter for damage such as broken or stripped electrical terminals, broken or cracked drive end housing. If no obvious damage is found, perform starter no-load test and pinion clearance check before disassembling starter motor.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.