Lull 944E-42, Service Manual

Page: 645 / 844

9.137 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Not
OK
Check for battery voltage at pin
2, wire [WL1A] (RED/WHT)
and 5, wire [WL1C] (RED/
WHT) at worklight switch.
Not
OK
If OK
Not
OK
If OK
Replace cab
roadlight harness.
Replace vehicle
roadlight harness.
Replace worklight switch.
Not
OK
Check for battery voltage at
pin A, wire [WL2] (LT BLU) and
pin B, wire [WL3] (YEL) on
worklight female connector.
If OK
Replace cab
roadlight harness.
If OK
Replace failed bulb.
Check for battery voltage at
pins N & P, wire [WLG2] (BLK)
& [WL3B] (YEL) (Left),
[WLG3] (BLK) & [WL3C] (YEL)
(Right) on rear worklights and
pins A & B, wire
[WL2A] (ORG) &
[WLG1] (BLK) boom
worklight connector.
Check for battery voltage at
pin 3, wire [WL2] (LT BLU),
and pin 6, wire [WL3] (YEL) at
worklight switch.
Worklights remain OFF
with ignition switch in the
RUN position and the
bottom of the worklight
switch pushed in.
Check for proper ground at
wire [EG7] (BLK) at ground
buss bar.
If OK
Clean, tighten and recheck.
Not
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).”
4. Verify that the high or low
beam circuits are operating. If
not, follow the steps listed at,
Section 9.8.41, “Light Power
Relay Circuit &
Troubleshooting (Option),”
before troubleshooting the
roadlight worklights circuit.
5. If one of the worklights work,
the circuit is fine, the failed
bulb needs to be replaced.