Powermaster claims that their alternators do not work well when spinning below 2400 RPM. A Powermaster 100 amp unit is usually a Delco 12SI and it puts out less power at low RPMs, not more then a less-amp alternator. Usually has to spin at 1600 RPM to make any power. If you've got an underdrive pulley that makes a engine-to-alterator drive ratio of 2-to-1, the engine has to be spinning at 800 RPM minimum to do anything. If you need 30 amps has to spin faster. To make the 100 amps it's rated at, it has to spin at 6000 RPM.
The newer Delco CS type alternators make more power at lower RPMs then the SI series.
How fast is the alterator spinning when you see the discharge? Most gas Chevy's have an engine-to-alternator pulley ratio of 2.5 to 1. So, it ought to work even with the engine idling at 600 RPM unless you've got a larger alternator pulley.
Also, what kind of amp gauge are using? Direct read, or the shunt-wire versions that some GMs use?
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