Lull 944E-42 Service Manual - Manual (Page 537)

9.27 Model 644E-42/944E-42 Rev. 6/04
Electrical System
d. After Relay Service
1. If the vehicle has dual batteries, connect both
negative battery cables (9 and 10) to both batteries.
Connect the lower negative battery cable (9) to the
negative (-) terminal on the lower battery (11). Swing
the upper battery box (12) in and make sure that the
lip (13) on the upper battery box slides below the
knob (14). Secure in place with the knob.
2. To release and lower the engine cover (15) from the
fully raised position, lift up slightly on the cover and
push the upper part of the right gas shock (16)
(orange tab) to the left. Line up the upper part of the
shock lock tube with the lower part of the gas shock
and pull the cover down to the closed position.
9.8 ELECTRICAL SYSTEM
TROUBLESHOOTING
9.8.1 Introduction
The electrical system produces, stores and distributes
electricity in the operation of the vehicle.
An engine-driven, 12 volt, 65 amp alternator equipped
with an internal, solid-state voltage regulator produces
electricity. Current from the alternator charges the battery
and powers electrical system components.
The battery provides power for starting the engine and
supplements the output of the alternator during periods of
peak demand.
The wiring on the standard 644E-42 vehicle is contained
within five separate wiring harnesses; the open cab
harness, vehicle power harness, vehicle transmission
harness, vehicle sensors harness and vehicle control
harness.
The wiring on the standard 944E-42 vehicle is contained
within six separate wiring harnesses; the open cab
harness, ECM cab harness, ECM vehicle power harness,
vehicle transmission harness, vehicle sensors harness
and vehicle control harness.
Note: Some early production units have a separate wire
harness running between the auxiliary hydraulic
pressure release switch and valve. Later production units
have this harness incorporated into the open cab
harness
Each wire within a harness has color-coded insulation
and is marked with a number to aid in identifying and
tracing each circuit and in making proper connections.
Fuses and relays are included with the cab harness to
help protect the electrical system and its components.
The main wiring diagrams in this section indicate
electrical circuits and components respective of their
approximate location on the vehicle.
The information in this section has been developed from
the perspective that all wires are connected and routed
as they were when the vehicle left the factory. Take into
account any disconnected or re-routed wires before
beginning to diagnose a circuit. Refer to the wiring
diagrams to test circuits for continuity or for shorts using
a digital multimeter, analog multimeter, test light,
ohmmeter, or low-reading voltmeter.
MU0650
9
10
11
14
13
12
4110390
1.
2.
OU0780
15 16
16