Johnston VT501 - Electrical System Faults

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MA8:3
V Range 501 l 651 l 801 Maintenance Manual
Johnston Sweepers Limited
Chapter - Fault Diagnosis
Electrical System
Fault Symptom Possible Cause
Beacon not working 1. Check vehicle ignition is on
2. Check beacon bulb/motor
3. Check feed to beacon
4. Check earth wire
5. Check fuse No. 1 for front. Fuse 2 for rear
6. Check switches
Work lights not working 1. Check vehicle ignition is on, master switch V is illuminated
2. Check bulb
3. Check feed to light
4. Check earth wire
5. Check fuse No. 1
6. Check switch
Flap (duals) fail to operate 1. Check feed to solenoid/Plug LED’s V11 or V12
2. Check solenoid
3. Check earth wires
4. Check fuse No. 4
5. Check switch
Nozzle fails to lower 1. Check feed to solenoid/Plug LED V2 or V10
2. Check solenoid
3. Check earth wires
4. Check fuse No. 4
5. Check switch
Channel brush fails to lower 1. Check feed to solenoid/Plug LED V4 or V10
2. Check solenoid
3. Check earth wires
4. Check fuse No. 4
5. Check switch
Channel brush fails to rotate 1. Check feed to solenoids/Plug LED (see Modus Operandi)
2. Check solenoid
3. Check earth wire
4. Check fuse No. 4
5. Check switch
Channel brush water fails to operate 1. Check feed to solenoid/Plug LED’s W03/W08
2. Check solenoid for operation/obstruction
3. Check earth wire
4. Check fuse No. 4
5. Check Wide Sweep Brush hydraulic
Wide sweep fails to lower 1. Check feed to solenoids/Plug LED’s V4
2. Check solenoid
3. Check earth wire
4. Check fuse No. 5
5. Check switch
Wide sweep fails to rotate 1. Check feed to solenoid/Plug LED
2. Check coil for operation
3. Check earth wire
4. Check fuse No. 5
5. Check switch
Wide sweep water fails to operate 1. Check feed to solenoid/Plug LED W01
2. Check solenoid for operation/obstruction
3. Check earth wire
4. Check fuse No. 5
5. Check switch
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