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With the key switch on, check for battery voltage between the black and white primary
wires attached to the two rearmost terminals at the top of the PMC. Check for good
connections at these terminals and the two other primary terminals on the PMC. If voltage is
not obtained, the trouble is in the PMC shut off contactor (Cp) or in the primary wires leading
to this contactor. Check connections and contacts of the contactor. If voltage is obtained,
proceed to next paragraph.
With key switch on, check for battery voltage between the red control (small) terminal
on the PMC and the black primary wire (-) on the rear terminal of the PMC. If voltage is not
obtained, the trouble is in the red wire between the motor terminal strip and the PMC (if
problem was in the control cable or elsewhere, Cp would not be operating). If voltage is
obtained, proceed.
TURN KEY OFF. CAUTION: CAPACITOR VOLTAGE (36, 48 or 60) STILL
EXISTS ACROSS THE REAR PRIMARY TERMINALS OF THE PMC. Remove the blue
and brown control wires from the PMC. With ohmmeter, check resistance across ends of blue
and brown wires with speed lever on off. You should get approximately 0 ohms. Now,
advance lever to full speed while observing ohmmeter – resistance should increase to 5000
ohms in either forward or reverse.
If resistance is correct and all voltages at the PMC are correct (as above), a bad PMC
is indicated and should be replaced. If resistance is infinite, there is probably an open in the
blue or brown wire. Check out these wires for continuity in the motor cable and control cable.
If resistance is always zero, check for a short between blue and brown in cable system. Also,
check for positive mechanical drive of the pot; that it has not slipped due to loose coupling or
nut.
If no trouble can be found as above, check for operation of the potentiometer by
placing ohmmeter on contacts at the console terminal strip. Resistance should vary
approximately 0 to 5000 ohms when pot is rotated with speed lever in either direction. Also
check for loose connections on pot and terminal strip. If pot is not providing proper
resistance, it must be replaced.