Vehicle Application: 2004 GMC Sierra 1500 5.3L, GAS, Vin T, Eng Cfg V8

Tests/Procedures: 1. Check the voltage on pin 15 of the Green Powertrain Control Module (PCM) connector, it should be 10-11 volts when the PCM wants the alternator to turn on.

3. If not,... Login to read more.