Electrical system – Lull 944E-42 Service Manual User Manual
Page 597
9.87
Model 644E-42/944E-42
Rev. 6/04
Electrical System
Not
OK
Repair/replace
open cab harness.
Replace auxiliary
joystick handle.
Not
OK
Unplug harness at auxiliary
joystick and measure
battery voltage at pin A.
Auxiliary hydraulics
do not function.
Wire [AH1] (RED/WHT) is
open. Repair/replace open
cab harness.
Replace fuse.
Plug harness back in at
auxiliary joystick, press button
and measure battery voltage
across auxiliary solenoid
AH A, connector wires
[AH2A] (BLU) and [AHG1]
(BLK) and solenoid AH B,
connector wires [AH2B]
(BLU) and [AHG2] (BLK).
Check auxiliary hydraulic
(F10) 5 amp fuse.
Not
OK
Not
OK
When button is pressed,
verify that solenoids are
magnetized by holding a
metal object next to the
solenoid. Or, test resistance
in solenoid. Refer to
Replace failed solenoid.
Not OK
If OK
If OK
If OK
If OK
If
OK
Problem is hydraulic.
Refer to Section 8,
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).”
Continued on 9.89
Move connector from
auxiliary joystick to middle
joystick, press button and
measure battery voltage
across auxiliary solenoid
AH A, connector wires
[AH2A] (BLU) and [AHG1]
(BLK) and solenoid AH B,
connector wires [AH2B]
(BLU) and [AHG2] (BLK).