Lull 944E-42 Service Manual - Manual (Page 585)

9.75 Model 644E-42/944E-42 Rev. 6/04
Electrical System
If
OK
If
OK
Repair/replace
open cab harness.
Replace ignition
switch.
If
OK
Replace 15
amp ignition
control
fuse (F2).
Check for power at
transmission shifter at
wire [TR9] (GRY/WHT).
Continued from 9.73
Check power at wire
[TR7A] (GRY) at
neutral start relay.
Not OK
If
OK
Replace
transmission
shifter.
Not OK
Check power
at wire
[PB6] (RED/WHT)
at ignition switch.
Check power
at wire
[PB1] (RED/TAN)
at ignition switch.
Not OK
Not OK
Check for power at wire
[PB4] (BLU) at transmission
control relay.
Not OK
If
OK
Replace VP1
diode board.
Check power at
wire [PB3] (BLK/WHT) at
park brake switch.
Not OK
If
OK
Replace
transmission
control relay.
Check power
at wire
[PB6B] (RED/GRN)
at transmission
control relay.
If
OK
Replace park
brake switch.
Check power at
wire [PB2A] (TAN) at park
brake switch.
Not OK
If
OK
Check power at
wire [PB2] (TAN) at ignition
switch.
Not OK
Repair/replace
open cab harness.
Not OK
Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. All connections relating to
circuit are clean and tight.
2. All grounding straps are
intact and securely
fastened, refer to Section
9.1.12, “General Overview
(Vehicle Ground Strap
Locations).”