Lull 944E-42 Service Manual - Manual (Page 625)

9.115 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Not
OK
Clean, tighten and
recheck.
Check wires [FWG3] (BLK)
and [FWG4] (BLK) for
proper ground at pump.
If OK
Not
OK
Clean, tighten and
recheck.
Not
OK
Not
OK
Replace closed
cab harness.
If OK
Replace front
wiper switch.
If
OK
Not
OK
Check wire [FW4] (BLU) at
front wiper switch for
battery voltage.
Not
OK
Replace closed
cab harness.
Place switch in HIGH speed
position.
Front wiper is inoperative
Check wire [FW1] (RED/WHT)
to front wiper switch for
battery voltage.
If OK
Not
OK
Check wire [FW3] (WHT) at
front wiper switch for
battery voltage.
Place switch in LOW speed
position.
If OK
Check wire [FW3] (WHT) at
front wiper motor for
battery voltage.
Not
OK
Replace closed
cab harness.
Replace front
wiper motor.
Check wire [FW4] (BLU) at
front wiper motor for battery
voltage. Check wires
[FWG1] (BLK) and
[FWG2] (BLK) for
proper ground.
If OK
Replace front
wiper switch.
If OK
Not
OK
Replace closed
cab harness.
Front washer is inoperative
Check wire
[FW1A] (RED/WHT) at
front washer switch for
battery voltage.
Not
OK
Place switch in ON position.
If OK
Not
OK
Replace front
washer motor.
Replace front
washer switch.
Check wire [FW5] (GRN) at
front washer switch for
battery voltage.
Not
OK
If
OK
Replace front
wiper motor.
Check wire [FWG2] (BLK) for
proper ground.
If OK
Before troubleshooting any electrical circuit,
ALWAYS begin by checking the following:
1. Fuses.
2. All connections relating to circuit are
clean and tight.
3. All grounding straps are intact and
securely fastened, refer to Section 9.1.12,
“General Overview (Vehicle Ground Strap
Locations).”