All Regulators (Except 1973)
Check with battery disconnected. Connect a voltmeter to terminal 61/D+ (generator terminal) of regulator and D + of generator. Connect a variable resistor, adjusted to rated output, to terminal 51/B+ of regulator (battery terminal). Slowly increase generator RPM, voltage should also increase. Relay cuts in when voltage drops abruptly. Reading at this point is cut in voltage (see specifications chart). Check reverse current (see specifications chart) by connecting generator to a half charged battery. Increase generator speed to maximum rated RPM, then decrease slowly. The current indicator will travel into discharge area until relay cuts out. Indicator should then return to zero. Check amperage just as relay cuts out.