Lull 944E-42 Service Manual - Manual (Page 633)

9.123 Model 644E-42/944E-42 Rev. 6/04
Electrical System
With the ignition ON and
the turn signal control
selector rotated to 2nd
position (Position Parking
Lights & Headlights) and
pulled back for high beams
ON, high beam indicator
and high beam remain
OFF.
Not
OK
Check for battery voltage at
pin 8, wire [RL1] (RED/WHT)
on turn signal control
selector connector.
Not
OK
Not
OK
If OK
Check for battery voltage at
pin 3 on turn signal control
selector connector.
If OK
Check for battery voltage at
pin 4, wire [HB1C] (DK BLU)
or wire [HB1D] (DK BLU) on
roadlight connector.
Replace turn signal
control selector.
If OK
Not
OK
Check for battery voltage at
pin C, wire [HB1A] (DK BLU)
on roadlight female
connector.
Replace cab
roadlight harness.
If OK
Replace vehicle
roadlight harness.
Replace failed roadlight.
Replace cab
roadlight harness.
Not
OK
Verify ground at roadlight
connector, pin 6.
If OK
Check for proper ground at
wire [EG7] (BLK) at ground
buss bar.
Not
OK
Clean, tighten and recheck.
If OK
Replace vehicle
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 low beam
circuit is operating. If not,
follow the steps listed at,
Section 9.8.41, “Light Power
Relay Circuit &
Troubleshooting (Option),”
before troubleshooting the
high beam lights circuit.
5. If one of the high beams work,
the circuit is fine, the failed
bulb needs to be replaced.