Lull 944E-42 Service Manual - Manual (Page 589)

9.79 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Continued on 9.81
Not
OK
If
OK
Repair/replace
open cab harness.
If
OK
Repair/replace
open cab harness.
Replace ignition
switch.
If
OK
If
OK
If
OK
Replace engine
start relay.
Replace 15
amp ignition
control
fuse (F2).
Not
OK
Check power at
wire [PB6A] (RED/ORG) at
park brake switch.
Check for power at wire
[ST3] (BLU/ORG) at engine
start relay.
Check for power at engine
start relay at wire [ST2] (BLU).
Check power at
wire [NS1] (BLU/ORG) at
neutral start relay.
Check power at
wire [NS2] (BLU/TAN) at
neutral start relay.
Check power at
wire [NS1] (BLU/ORG) at
park brake switch.
Check power at
wire [TR7A] (GRY)
at neutral start
relay.
Continued from 9.77
With ignition switch
in start position,
check starter
solenoid terminal,
wire [ST2] (BLU)
connection for
battery voltage.
Repair/replace
open cab harness.
Check for power at engine
start relay at wire [ST1] (RED).
Not OK
Not OK
If
OK
Repair/replace
ECM vehicle
power harness.
Not OK
Check power at
wire [NS2] (BLU/TAN) at
female bulkhead connector.
Repair/replace
ECM vehicle
power harness.
Not
OK
If
OK
Not OK
Repair/replace
ECM vehicle
power harness.
If
OK
Not OK
Not OK
Not OK
Check power at
wire [PB6] (RED/WHT) at
ignition switch.
Check power at
wire [PB1] (RED/TAN) at
ignition switch.
Not OK
Replace park
brake switch.
If
OK
Not OK
If OK
If
OK
Replace neutral
start relay.
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).”