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IF PTO CLUTCH WILL NOT ENGAGE
HOUR METER NOT OPERATING
Hour meter has a positive and a
negative post. Gray wire should go on
the positive. Power is supplied from the
ignition switch.
Green wire from hour meter is
grounded by the oil pressure switch,
therefore only has a ground when the
engine is running.
Apply a negative ground to this terminal
Apply 12 volts to this terminal. Clutch should activate,
if it doesn’t, clutch is defective.
If clutch checks OK, use a voltmeter to measure if
there is 12 volts at the brown wire’s terminal. First
turn ignition switch to the ON position but don’t start
the engine. Now engage the PTO switch. For the first
test put the negative probe on a good ground, not on
the white wire’s terminal in the plug. If no voltage is
measured, move on to next test.
If all checked good in the two previous tests, the
problem may now be a poor ground on the white wire
in the clutch plug. Check by testing for continuity to
ground or check for voltage between the two terminals
With the PTO switch ON there should be continuity
between these two connectors, if not, replace switch. If
switch tested good, check wires and connectors back
to ignition switch and back to clutch plug.
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