4-70 4203781 First Edition
ELECTRICAL
4
Symptom: Air filter service light does not turn on.
Symptom: Return filter service light does not turn on.
Symptom: Low charge pressure light does not turn on.
Symptom: Low charge pressure light stays on with engine running.
Symptom: Hyd oil temp light does not turn on.
Probable Cause Remedy
Faulty ground circuit. Check continuity between air filter pressure switch blk wire terminal and ground.
Continuity must be indicated.
Faulty air filter pressure switch. With a jumper wire, connect the air filter pressure switch blu/wht wire terminal to ground.
With the key switch in the run position, check the air filter service light. If the light turns
on, replace the air filter pressure switch.
Faulty wiring. Check continuity between air filter pressure switch blu/wht wire terminal and the air filter
service light. Continuity must be indicated.
Probable Cause Remedy
Faulty ground circuit. Check continuity between return filter pressure switch blk wire terminal and ground.
Continuity must be indicated.
Faulty air filter pressure switch. With a jumper wire, connect the return filter pressure switch tan wire terminal to ground.
With the key switch in the run position, check the return filter service light. If the light
turns on, replace the air pressure switch.
Faulty wiring. Check continuity between return filter pressure switch tan wire terminal and the return
filter service light. Continuity must be indicated.
Probable Cause Remedy
Faulty low charge pressure switch. With the key switch in the OFF position, check continuity between low charge pressure
switch and ground. Continuity must be indicated. If continuity is not indicated, replace
low charge pressure switch.
Faulty low charge pressure light switched
power circuit.
With the key switch in the run position (engine off), measure voltage between engine oil
pressure light org wire terminal and ground. Voltage must be approximately 12 VDC.
Faulty low charge pressure switch circuit. Check continuity between low charge pressure switch terminal and low charge pressure
light terminal (gry/red wire). Continuity must be indicated.
Probable Cause Remedy
Low charge pressure. Check charge pressure.
Faulty low charge pressure switch. If charge pressure tests good, replace low charge pressure switch.
Probable Cause Remedy
Faulty hyd oil temp switch. With a jumper wire, connect the hyd oil temp switch terminal to ground. With the key
switch in the run position, check the hyd oil temp light. If the light turns on, replace the
hyd oil temp switch.
Faulty wiring. Check continuity between hyd oil temp switch grn/wht wire terminal and the hyd oil temp
light. Continuity must be indicated.
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