95 Chev cavalier charging problem?

[ratherbefishin]

The charging system is not working, WE have 2 known good alternators. It has battery voltage at main wire, battery voltage at 2 of 3 wires on the plug in ( The orange & brown) Nothing at gray,( Diagrams showing L/blue wierd).

Alldata diagram shows 5 volts at the brown wire, It has Batt voltage

*** Batt light is working on the dash***

Things we have tried...Checked continuity @ gray wire at alt to pcm ( checked good ), replaced pcm with a used one , Tryed jumpin 5volts to brown, ALt case does have a good ground , not sure if it matters?

Im thinking the gray wire might have something to do with it as its marked line input on alldata diaram ( Is this the wire that turns on the alt? If anyone can help that would be awesome!!!!

[Jeremy airjer W]

What's the voltage t the battery with the engine running?

What's the voltage at the back of the alternator with the engine running?

Have you used a scan tool to command the field input on (power up the light blue wire)?

What engine?

[ratherbefishin]

Its the good old 2.2 engine lol, With engine running it has around 12.3-12.5v at the main wire off the alt to batt. WIth eng on/off batt voltage stays about the same.

Should the field input have voltage with eng running?

I checked with guys at my work they are kind of stumped as well, our main elec. guy quit and i consider myself a rookie at elec. stuff still.

I have not tried a scan tool yet as i don't own one, work does but of course cant bring it home.