Lull 944E-42 Service Manual - Manual (Page 620)

Electrical System
9.110 Model 644E-42/944E-42 Rev. 6/04
9.8.36 Cab Heater & Air Conditioning Blower Motor Circuit & Troubleshooting
Schematic is drawn with the ignition switch in the RUN position.
HIGH/LOW
PRESSURE
SWITCH
LOW - (28 PSI)
HIGH - (455 PSI)
CMP1A
12V BUSS BAR
C
A
B A
B
C BA1
POWER
MALE
CONNECTOR
BB1
BC1
POWER
FEMALE
CONNECTOR
B
C A
B
C POTG
VALVE
POTENTIOMETER
A POTP
CNDP
AC
SWITCH
1 3
2
BLP
190
ACG1
AC2
BLC
BLM
BLH
BLL
AC2A BLM
BLH BLL EVG AC1
HVG
HV8
POTG
ACG1
CNDP
CNDG
CNDS
EVG
CAB
GRND
STUD
CNDG
POTP
HVP
195
AC2A
AC2
CNDS
THERMOSTAT
(35°F)
F
E
HEATER/AC
BLOWER
MOTOR
POWER
GND
M
BLOWER
MOTOR
RESISTOR
PACK
BLOWER
B F
C A D E
HEATER VALVE
POWER GROUND
7
8
10
8
7
10
B A
C
POWER
GND
M
AC CONDENSER
87A 87
30
86
85
POWER
GND
M
BLC
BLB
H
L M
B C
B
H
C
O
L M
BLOWER
SWITCH
CAB
POWER
RELAY
87A 87
30
86
85
CP2
CP3
FJ12
16
FJ13
17
FJ14
18
19
F16 10
FRONT WIPER
(OPTION)
P
F17 25
HEATER FAN
(OPTION)
Q
F18 7.5
SKYLIGHT WIPER
(OPTION)
R
F19 7.5
REAR WIPER
(OPTION)
S
F25 40
LIGHTS MAIN
(OPTION)
Y
F26 25
CONDENSER FAN
(OPTION)
Z
FJ21
28
FJ21
FJ20
26
FJ19
25
AA 27
AB 28
CP3
F27
OPEN
F28
OPEN
15 F15 40
CLOSED CAB
MAIN (OPTION)
O
IGNITION
RELAY
87A 87
30
86
85
IG1
BA4
BA3
F1 40
OPEN CAB
VEHICLE MAIN
F2 15
IGNITION
CONTROL
BA1A
B
10
PB2A
2
PB2
PB1
IGNITION
SWITCH
ACC IGN
B+
OFF
ACC
IGN
ST
To
Transmission
Fuse (F3)
To
Park Brake
Switch
BA3
BC1A
BB1A
1
A
ACG
200
STARTER
GND (-)
+
+
-
BATTERY 1
ENGINE
BLOCK
CP1
CP1
COMPRESSOR
CLUTCH
INTERNAL
GROUND
TO ENGINE
B
A
MU1621
Refer to
page 9.48
Refer to
pages 9.52
or 9.54
= See Pages 9.48, 9.49, 9.50 or 9.51.