Came home from work and read my dually Helms manual as it has a CS130 alt. The four prong plug has P'L'I'S' labeled for pins.
P = Stator reading, for TACH reading of a diesel.
L = goes t ALT light through a 30-ohm resistor, or voltmeter as in my case.
I = Tied to a switch for turn on, usually through another resistor. May be unhooked if L terminal is connected.
S = Sense wire to monitor voltage at any point chosen.
Mine has a wire attached to L terminal for volt meter and of course, BAT. Manual as long as it doesn't gp below 13 volts or over 16 and is within 15 amps of rated output, alt is good.
If unplug 4-prong connector and gen or alt light goes out with engine running, alt is bad. If plugged in, light on with engine running, alt is bad.
So, if eng CB is off, it may mean the test machine may not be setup correctly. Meaning not enough resistors tied to L & I terminals.
Check library for a schematic. It will explain all.
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