ELECTRICAL
4181384 First Edition 4-57
4
Weight Transfer Circuit
Symptom: Weight transfer solenoids do not energize.
Instrumentation Circuit
Symptom: Engine oil pressure light does
not turn on.
Symptom: Engine oil pressure light stays on with engine running.
Symptom: Hydraulic filter light does not turn on with a blocked filter.
Probable Cause Remedy
Raise/lower switch was not momentarily
placed in the lower position.
Momentarily place the raise/lower switch in the lower position.
Faulty weight transfer switch. Test switch. (See “Rocker Switch Test” on page 4-66.)
Faulty weight transfer solenoids. Test solenoids. (See “Solenoid Test” on page 4-68.)
Faulty 12V weight transfer solenoid output
circuit.
Place the weight transfer switch in the on position.
Momentarily place the raise/lower switch in the lower position.
Measure voltage between control module 12V lower solenoid output terminal and ground.
Measure voltage between weight transfer solenoid (Y6) yel/org wire terminal and ground.
Measure voltage between weight transfer solenoid (Y7) grn/vio wire terminal and ground.
Voltage must be approximately 12 VDC.
Open weight transfer solenoid ground
circuit.
Check continuity between weight transfer solenoid (Y6) blk wire terminal and ground.
Check continuity between weight transfer solenoid (Y7) blk wire terminal and ground.
Continuity must be indicated.
Probable Cause Remedy
Faulty engine oil pressure light. Check light bulb.
Open 5A Fuse F9. Test fuse. (See “Fuse Test” on page 4-61.)
Faulty engine oil pressure switch. With the key switch in the off position, check continuity between engine oil pressure
switch and ground. Continuity must be indicated. If continuity is not indicated, replace
engine oil pressure switch.
Faulty engine oil pressure light switched
power circuit.
With the key switch in the run position (engine off), measure voltage between engine oil
pressure light grn/pnk terminal and ground. Voltage must be approximately 12 VDC.
Faulty engine oil pressure switch circuit. Check continuity between engine oil pressure switch terminal and engine oil pressure
light wht/brn terminal. Continuity must be indicated.
Probable Cause Remedy
Low engine oil pressure. Check engine oil pressure.
Faulty engine oil pressure switch. If engine oil pressure tests good, replace engine oil pressure switch.
Probable Cause Remedy
Faulty hydraulic filter light. Check light bulb.
Open 5A fuse F9. Test fuse. (See “Fuse Test” on page 4-61.)
Faulty hydraulic filter light switched power
circuit.
With the key switch in the run position (engine off), measure voltage between hydraulic
filter light grn/pnk terminal and ground. Voltage must be approximately 12 VDC.
Faulty hydraulic filter switch circuit. Check continuity between hydraulic filter switch terminal and hydraulic filter light wht/brn
terminal. Continuity must be indicated.
Faulty hydraulic filter switch. Replace hydraulic filter switch.
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