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Maintenance Instructions ELECTRICAL SYSTEM
IGNITION SWITCH CIRCUITS
OFF
GLOW PLUG
START
RUN
OFF
OFF
OFF
OFF
START
GLOW PLUG
RUN
RUN
START
GLOW PLUG
RUN
RUN (LOW)
RUN (HIGH)
GLOW PLUG
START
ALL OPEN
30 + 19 + AC
30 + 17 + 50 + AC
30 + AC
30 + 87
30 + 87A
30 + 87A
30 + 87A
30 + 87A
30 + 87
30 + 87
30 + 87A
30 + 87A
30 + 87A
30 + 87
OPEN
OPEN
30 + 87
30 + 87A
30 = BATTERY
19 = GLOW PLUGS
50 = START
GAUGES, AND FAN
RELAY - A
RELAY - B
RELAY - C
RELAY - D
FAN SPEED CONTROL
FUEL SOLENOID RUN RELAY (HOLD)
WARNING RELAY
FUEL SOLENOID START RELAY (PULL)
AC = FUEL PUMP, FUEL SOLENOID
OPTIONAL
LIGHT
RED
BLK
BLK/WHT
BLK/WHT
BLK/WHT
BLK/WHT
BLK/WHT
YEL
BLK
FUEL
PUMP
POWERFIL
MOTOR
BLK
RED
YEL/GRN
BLU/RED
PUR
WATER
TEMP
SWITCH 1/4"
GRN GRN
GRN
GRN
87
85 86
87A
30
GRA
YEL
BLK
BLK BLK
RESISTOR
BRN
BLK
RED
WHT
BLK
BLK
YEL/GRN
YEL/GRN
YEL/GRN
BLK
GRA
YEL
PUR
PUR
RED
RED
RED
RED
PUR
YEL
GRA
BLU/RED BLU/RED
ORG/WHT
ORG
GRA
ORG
RED/BLK
ENGINE
RED
RED
RED
RED
RED
RED
RED
BLK
BLU
RED
RED
RED
7 AMP
CIRCUIT
BREAKER
RED
RED
RED
RED
RED
RED
BLU
RED
BLK
BRNBRN
RED
FOR
TAIL
WHEEL
LOCK
BRN
RED
ORG
GRA
WATER
LIGHT
TEMP
YEL/RED
YEL/RED
ORG/WHT
RELAY - B
RELAY - A
RELAY - E
ORG
85
30
86
87
87A
ORG
YEL
IGNITION
PUR
PUR
BLU
HORN
+
WARNING
PUR
YEL/GRN
BLK/WHT
YEL/GRN
RED
10 AMP
CIRCUIT
BREAKER
RED
GRA
BLU/RED
BLK
BLK
BLK
GRA
LIGHTS
GRA
HOUR
METER
VOLTAGE
METER
TEMP
WATER
SOLENOID
FUEL
GLOW PLUGS
FAN
RELAY - D
GRN
SWITCH
WATER TEMP
GAUGE SENDER
ORG
STARTER
STARTER SOLENOID
ALTERNATOR
OIL PRESSURE
YEL
RED
RED BLK
BLK
HORN
OPTIONAL
LIGHT
BATTERY
_
BLK
CHASSIS
GROUND
BLK
BLK
ORG/GRN
FSC
NEUTRAL
INTERLOCK
SWITCH
ORG/WHT
BRN
GRA
SEAT
SWITCH
REVERSING
MODULE
RED
RED RED
REDRED
GRN
GRN
RELAY - C
GRN
TIME
DELAY
MODULE
ORG
GRN
GRN
BRNBRN
PTO
SWICH
INTERLOCK
RED
BLK
BLK
BLK
RED
YEL YEL
YEL
RED
RED
RED/BLK
BLK
+
40 AMP
CIRCUIT
BREAKER
85
WATER
TEMP
SWITCH 3/8"
OIL
PRESSURE
LIGHT
+
-
86
30
8685
87
87A
86
87
GI
GI
S
50
30
-
R
OFF
START
PTO ON
OPEN
30 + 87A
30 + 87A
RELAY - E
START/TIME DELAY RELAY
BLK/WHT
30
87A
85
17
19
GRASS PAK
SWITCH
R
WALKER MODEL MDD
Beginning S/N 2001-49370
AC
30
30 AMP
CIRCUIT
BREAKER
17 = START / REVERSING MODULE
BLK
+
-
Wiring Diagram - Model MDD