Lull 944E-42 Service Manual - Manual (Page 641)

9.131 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Not
OK
Replace cab
roadlight harness.
With the ignition ON and
the turn signal control
selector pushed up for left
turn signal or down for right
turn signal, turn signal
indicator and turn signals
remain OFF.
Not
OK
With hazard switch OFF,
check for battery voltage at
pin 1, wire [HZ1] (ORG/RED)
on hazard switch.
If OK
Not
OK
Check for battery voltage at
pin 2, wire [HZ2] (PUR) on
hazard switch.
Replace hazard switch.
Not
OK
Disconnect twelve pin plug at
turn signal control selector
and check for voltage at
roadlight harness pin 11, wire
[HZ3B] (PUR).
If OK
Verify continuity between
twelve pin plug at turn signal
control selector pin 9 or 10
and roadlight female
connector pin D or E.
If OK
Replace cab
roadlight harness.
If OK
Replace turn signal control.
Replace cab
roadlight harness.
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 hazard light
circuit is operating. If not,
follow the steps listed at,
Section 9.8.45, “Roadlight
Hazard Lights Circuit &
Troubleshooting (Option),”
before troubleshooting the
turn signal circuit.
5. Verify that the parking lights
circuit is operating. If not,
follow the steps listed at,
Section 9.8.41, “Light Power
Relay Circuit &
Troubleshooting (Option),”
before troubleshooting the
turn signals circuit.
6. If one of the turn signals work,
the circuit is fine, the failed
bulb needs to be replaced.