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Re: Silverado Alternator not putting out proper volts - Already changed the alternato
Alternator output voltage and amperage is varied and controlled by the PCM.
Wiring at the alternator:
The red wire comes from the battery and through a fuse link and then to the output terminal of the alternator. It should show battery voltage at all times.
The dark blue wire goes to supplemental brake assist.
The brown wire goes to the PCM for the charge indicator control.
The grey wire comes from the PCM and goes to the voltage regulator inside the alternator. The PCM monitors voltage and load on the battery and determines what the charge voltage should be. It then sends a signal, using a duty cycle, to the voltage regulator. The greater the load on the battery, the longer the duty cycle.
"Old School".... ideal voltage, in a perfect world, was 14.2 volts. Now that the PCM is in the equation, "Old School" is out!
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You have to know how it works,
to figure out why it doesn't.
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