Skyjack SJ85 AJ Service Manual page 98

Electrical System
All Controls Inoperative from Base Console:
NOTE
Functions may be disabled by the dual load zone system and/or overload system if equipped. Please first
ensure the boom is fully retracted and there are no faults in the dual load/overload system.
1. Defective ignition/enable switch S5.
2. Loose or broken wire #10A from ignition/enable
switch S5 to base terminal block.
3. Open or defective diode D10A.
4. Loose or broken wire #20 from diode D10A to
base terminal block.
5. Missing or broken terminal block jumper between
wire #20 and #21.
NOTE
The jumper is removed if the MEWP is equipped with a generator option.
6. Loose or broken wire #21 from base terminal
block to relay 21CR.
7. Loose or broken wire #21 from base terminal
block to relay 21CR.
8. Loose or broken wire #02 from base terminal
block to relay 21CR.
9. Defective relay 21CR.
10. Loose or broken wire #21A from relay 21CR to
main harness plug pin #3.
11. Loose or broken wire #21A from main harness
plug pin #3 to dump valve 2H-21A.
12. Loose or broken wire #02 from dump valve
2H-21A to main harness plug.
13. Defective dump valve coil 2H-21A.
14. Loose or broken wire #10A from base terminal
block to 01ACR1 relay.
15. Defective relay 01ACR1.
16. Loose or broken wire #10B from 01ACR1 relay to
resistor R1.
17. Defective resistor R1.
SJ85 AJ
Section 4 – Troubleshooting Information
Check continuity through switch when activated.
Replace if defective.
Check continuity. Replace if defective.
Check diode. Replace if defective.
Check continuity. Replace if defective.
Check for jumper. Replace if missing or broken.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check relay. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity and resistance through coil.
Replace if defective.
Check continuity. Replace if defective.
Check relay. Replace if defective.
Check continuity. Replace if defective.
Check resistor, replace if defective.
229044ADA
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