Insert shank of 1/16-inch drill bit (3) in brush
holder access hole (4).
Connect jumper (5) to negative output terminal (6) and
to drill bit (3).
Connect multimeter to output terminals, start engine in accordance with TM 10-4320-307-10, and run at
approximately 1200 to 1500 RPM.
Insure that all electrical accessories are OFF to avoid high voltage damage.
Check DC voltage across output terminals and make a note of it. Voltage should be between
27.8 and 28.2 Vdc.