Steve@Advance said: (quoted from post at 23:43:51 01/09/15) Yes, the small wires need to have power. The S terminal will be hot all the time. The F or L terminal (depending how it's wired) will be hot with the ignition on.
No, the small wires go directly to the PCM. The S terminal is not even used. The engine computer controls of the charging system on these trucks. The two little wires are "F" (gray) and "L" (brown). The PCM uses a duty cycle on the field circuit to control output. The "L" circuit is simply for charge indicator.
Sadly a lot of vehicles have moved to PCM controlled alternators some for a long time, it sure complicates matters when trying to decide if the PCM could be the problem or not. Diagnosis should include testing the PCM for codes and tracing wires from alt to pcm, but more than likely its the alternator that is the problem, as easy as it is to remove I would have them double check it. After that its time to test wiring.
This post was edited by 4play at 20:20:56 01/09/15.
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