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E4
72938
ELECTRICAL SYSTEMS
WIRING DIAGRAMS
4E-0 - WIRING DIAGRAMS 90-823226--1 996
Table of ContentsPage
Wiring Colors for MerCruiser 4E-1. . . . . . . . . . . . . . . MCM V-6 Alpha Thunderbolt IV 4E-2. . . . . . . . . . MCM V-6 Gen + Alpha Thunderbolt V Without Knock Sensor 4E-3. . . . . . . . . . . . . . . . . MCM V-6 Gen + Bravo Thunderbolt V Without Knock Sensor 4E-4. . . . . . . . . . . . . . . . . MCM 262 Magnum EFI Gen + Alpha and Bravo Starting and Charging Harness 4E-5. . . . MCM 262 Magnum EFI Gen + Alpha (VaporSeparator Tank [VST])EFI System Harness 4E-6. . . . . . . . . . . . . . . . . . . MCM 262 Magnum EFI Gen + Bravo (Vapor Separator Tank [VST])EFI System Harness 4E-7. . . . . . . . . . . . . . . . . . . MCM 262 Magnum EFI Gen + Alpha (Cool Fuel System) EFI System Harness 4E-8. MCM 262 Magnum EFI Gen + Bravo (Cool Fuel System) EFI System Harness 4E-9. Quicksilver Instrumentation 4E-10. . . . . . . . . . . . Dual Station Wiring (Using a Neutral SafetySwitch in Only One Remote Control) 4E-11. . . . Dual Station Wiring (Using A Neutral Safety Switch In Both Remote Controls) 4E-12. Dual Station Wiring (Using a Neutral Safety Switch in Engine Wiring Harness) 4E-13EFI Wiring Diagram (Chart 1 Of 4) 4E-14. . . . . . EFI Wiring Diagram (Chart 2 Of 4) 4E-15. . . . . . EFI Wiring Diagram (Chart 3 Of 4) 4E-16. . . . . . EFI Wiring Diagram (Chart 4 Of 4) 4E-17. . . . . .
WIRING DIAGRAMS - 4E-190-823226--1 996
Wiring Colors for MerCruiserNOTE: Color codes listed below DO NOT apply to fuel injection system harnesses.
BIA COLOR CODE AND ABBREVIATIONS WHERE USED
BLACK (BLK) All Grounds
BROWN (BLU) Reference Electrode - MerCathode
ORANGE (ORN) Anode Electrode-MerCathode
LT. BLUE/WHITE (LT BLU/WHT) Trim - ”Up” Switch
GRAY (GRY) Tachometer Signal
GREEN/WHITE (GRN/WHT) Trim - ”Down” Switch
TAN (TAN) Water Temperature Sender to Gauge
LIGHT BLUE (LIT BLU) Oil Pressure Sender to Gauge
PINK (PNK) Fuel Gauge Sender to Gauge
BROWN/WHITE (BRN/WHT) Trim Sender to Trim Gauge
PURPLE/WHITE (PUR/WHT) Trim - ”Trailer” Switch
RED (RED) Unprotected Wires from Battery
RED/PURPLE (RED/PUR) Protected (Fused) Wires from Battery
RED/PURPLE (RED/PUR) Protected (+12V) to Trim Panel
ORANGE (ORN) Alternator Output
PURPLE/YELLOW (PUR/YEL) Ballast Bypass
PURPLE (PUR) Ignition Switch (+12V)
YELLOW/RED (YEL/RED) Starter Switch to Starter Solenoid to Neutral StartSwitch
4E-2 - WIRING DIAGRAMS 90-823226--1 996
MCM V-6 Alpha Thunderbolt IV
71877
C
B
D
A
1 2
3
12
3
12
3
1
2
3
45
6
78
NEWSTYLE
BOTTLE
OLD STYLEBOTTLE
A -Ignition System1 -Distributor2 -Shift Cutout Switch3 -Ignition CoilB -Starting System1 -Alternator2 -Electric Choke3 -Ground Bolt4 -Starter5 -Circuit Breaker6 -Starter Slave Solenoid7 -Electric Fuel Pump8 -Oil Pressure Cut-Off Switch
C-Audio Warning System1 -Water Temperature2 -Drive Unit Oil Level (If Equipped)3 -Oil Pressure SwitchD -Instrumentation System1 -Oil Pressure Sender2 -Water Temperature Sender3 -Trim Sender
WIRING DIAGRAMS - 4E-390-823226--1 996
MCM V-6 Gen + Alpha Thunderbolt V Without Knock Sensor
1
2
3
1
2
3
4 5
6
12
3
1
3
A
B
2
8 774813
NOTE
C
D
NOTE: TAN/BLU wire is not used at distributor.A -Ignition System1 -Distributor2 -Shift Cutout Switch3 -Ignition CoilB -Starting System1 -Alternator2 -Electric Choke3 -Ground Bolt4 -Starter5 -Circuit Breaker6 -Starter Slave Solenoid7 -Electric Fuel Pump8 -Oil Pressure Cut-Off Switch
C-Audio Warning System1 -Water Temperature2 -Drive Unit Oil Level (If Equipped)3 -Oil Pressure SwitchD -Instrumentation System1 -Oil Pressure Sender2 -Water Temperature Sender3 -Trim Sender
4E-4 - WIRING DIAGRAMS 90-823226--1 996
MCM V-6 Gen + Bravo Thunderbolt V Without Knock Sensor
1
1
23
45
6
12
3
1
3
A
2
8 7
2
74814
NOTE
C
B
D
A
NOTE: TAN/BLU wire is not used at distributor.A -Ignition System1 -Distributor2 -Ignition CoilB -Starting System1 -Alternator2 -Electric Choke (2 BBL Only)3 -Ground Bolt4 -Starter5 -Circuit Breaker6 -Starter Slave Solenoid7 -Fuel Pump8 -Oil Pressure Cut-Off Switch
C-Audio Warning System1 -Water Temperature2 -Drive Unit Oil Level (If Equipped)3 -Oil Pressure SwitchD -Instrumentation System1 -Oil Pressure Sender2 -Water Temperature Sender3 -Trim Sender
WIRING DIAGRAMS - 4E-590-823226--1 996
MCM 262 Magnum EFI Gen + Alpha and Bravo Starting and Charging Harness
74925
b
c
a
1
2
32
1
1
2
3
4
5
d
C
B
A
76
A– Audio Warning System1 - Drive Unit Oil Level2 - Oil Pressure SwitchB– Instrumentation System1 - Trim Sender2 - Water Temperature Sender3 - Oil Pressure SenderC - Charging and Starting System1 - Starter Slave Solenoid2 - Circuit Breaker3 - Starter4 - Ground Stud5 - Alternator6 - Oil Pressure Cut-Off Switch7 - Fuel Pump
a - Harness Connector to EFI System Harnessb - Positive (+) Power Wire to EFI System Harnessc - Auxiliary Tachometer Leadd -90 Amp Fuse (DO NOT Remove)
4E-6 - WIRING DIAGRAMS 90-823226--1 996
MCM 262 Magnum EFI Gen + Alpha (Vapor Separator Tank [VST])EFI System Harness
74929
2
3
4
5
6
7
8
9
10
11
1
12
13
14
15
16
17
18
19
20
21
NOTE: All BLACK wires with a ground symbol are interconnected within the EFI system harness.
1 - Vapor Separator Tank (VST)2 - Throttle Body3 - Distributor4 - Coil5 - Knock Sensor (KS) Module6 - Data Link Connector (DLC)7 - Manifold Absolute Pressure (MAP) Sensor8 - Knock Sensor9 - Idle Air Control (IAC)10- Throttle Position (TP) Sensor
11- Engine Coolant Temperature Sensor (ECT)12- Electronic Control Module (ECM)13- Fuel Pump Relay14- Ignition/System Relay15- Fuel Pump Fuse16- ECM/Ignition Feed/KS Module/Injectors Fuse17- ECM/DLC/Battery Fuse18- Harness Connector To Starting/Charging Harness19- Shift Cutout Switch20- Lanyard Stop Switch21- Positive Power Wire To Engine Circuit Breaker
WIRING DIAGRAMS - 4E-790-823226--1 996
MCM 262 Magnum EFI Gen + Bravo (Vapor Separator Tank [VST])EFI System Harness
74928
2
3
4
5
6
7
8
9
10
11
1
12
13
14
15
16
17
18
19
NOTE: All BLACK wires with a ground symbol are interconnected within the EFI system harness.
1 - Vapor Separator Tank (VST)2 - Throttle Body3 - Distributor4 - Coil5 - Knock Sensor (KS) Module6 - Data Link Connector (DLC)7 - Manifold Absolute Pressure (MAP) Sensor8 - Knock Sensor9 - Idle Air Control (IAC)10- Throttle Position (TP) Sensor
11- Engine Coolant Temperature Sensor (ECT)12- Electronic Control Module (ECM)13- Fuel Pump Relay14- Ignition/System Relay15- Fuel Pump Fuse16- ECM/Ignition Feed/KS Module/Injectors Fuse17- ECM/DLC/Battery Fuse18- Harness Connector To Starting/Charging Harness19- Positive (+) Power Lead To Engine Circuit Breaker
4E-8 - WIRING DIAGRAMS 90-823226--1 996
MCM 262 Magnum EFI Gen + Alpha (Cool Fuel System)EFI System Harness
74929
2
3
4
5
6
7
8
9
10
11
1
12
13
14
15
16
17
18
19
20
21
NOTE: All BLACK wires with a ground symbol are interconnected within the EFI system harness.
1 - Vapor Separator Tank (VST)2 - Throttle Body3 - Distributor4 - Coil5 - Knock Sensor (KS) Module6 - Data Link Connector (DLC)7 - Manifold Absolute Pressure (MAP) Sensor8 - Knock Sensor9 - Idle Air Control (IAC)10- Throttle Position (TP) Sensor
11- Engine Coolant Temperature Sensor (ECT)12- Electronic Control Module (ECM)13- Fuel Pump Relay14- Ignition/System Relay15- Fuel Pump Fuse16- ECM/Ignition Feed/KS Module/Injectors Fuse17- ECM/DLC/Battery Fuse18- Harness Connector To Starting/Charging Harness19- Shift Cutout Switch20- Lanyard Stop Switch21- Positive Power Wire To Engine Circuit Breaker
WIRING DIAGRAMS - 4E-990-823226--1 996
MCM 262 Magnum EFI Gen + Bravo (Cool Fuel System)EFI System Harness
74928
2
3
4
5
6
7
8
9
10
11
1
12
13
14
15
16
17
18
19
NOTE: All BLACK wires with a ground symbol are interconnected within the EFI system harness.
1 - Vapor Separator Tank (VST)2 - Throttle Body3 - Distributor4 - Coil5 - Knock Sensor (KS) Module6 - Data Link Connector (DLC)7 - Manifold Absolute Pressure (MAP) Sensor8 - Knock Sensor9 - Idle Air Control (IAC)10- Throttle Position (TP) Sensor
11- Engine Coolant Temperature Sensor (ECT)12- Electronic Control Module (ECM)13- Fuel Pump Relay14- Ignition/System Relay15- Fuel Pump Fuse16- ECM/Ignition Feed/KS Module/Injectors Fuse17- ECM/DLC/Battery Fuse18- Harness Connector To Starting/Charging Harness19- Positive (+) Power Lead To Engine Circuit Breaker
4E-10 - WIRING DIAGRAMS 90-823226--1 996
Quicksilver Instrumentation
To E
ngin
e H
arne
ss
NOTE 1
NOTE 1
NOTE 1
NOTE 2
74046
2
5
6
7
8
9
13 4
LATER STYLEBUZZER
EARLY STYLEBUZZER
NOTE 1: Connect wires together with screw and hex nut. Apply Quicksilver Liquid Neoprene to connection andslide rubber sleeve over connection.NOTE 2: Power for a second fused accessory panel may be taken from this connection. Load MUST NOT ex-ceed 35-40 amps. Panel ground wire MUST BE connected to instrument terminal that has an 8 gauge BLACK(ground) harness wire connected to it.1 - Tachometer2 - Audio Warning Buzzer (if Equipped)3 - Oil Pressure4 - Water Temperature5 - Battery Meter6 - Ignition Switch7 - Trim Indicator8 - To 12 Volt Source (PURPLE wire connection)9 - 20 Ampere Fuse
WIRING DIAGRAMS - 4E-1190-823226--1 996
Dual Station Wiring (Using a Neutral Safety Switch in Only One RemoteControl)
72940
BRN/WHT
PUR
GRY
BLK
YE
L/R
ED
NOTE 3
PU
R
PU
R
GR
Y
BLK
BLK
LT. B
LU
BLK
PU
R
TAN
PU
R
BLK
RED/PUR
ORN
PUR
PU
R
GR
Y BLK
BLK
PU
R
LT. B
LU
BLK
PU
R
TAN
OR
N
RE
D/P
UR
PU
R
BLK NOTE 2
NOTE 3
NOTE 1
YEL/RED
YE
L/R
ED
NOTE 3
NOTE 3BRN/WHTNOTE 1
YEL/RED
YEL/RED
YEL/RED
BS I
SEND SEND SEND
LT
LT
LT
LT
SW
12V12V 12V 12V
GND
UNSW
SIG
GND GND GND
SEND SEND SEND
LT
LT
LT
LT
SW
12V12V 12V 12V
GND
UNSW
SIG
GND GND GND
3 4 51 2
A
B
1 2 3 4 5
6
7
NOTE 1: BROWN/WHITE wire is taped back at instrument end. If installing on boat that is equipped with Mer-Cruiser stern drive, BROWN/WHITE wire is connected to trim sender terminal block. If installing on MerCruiserInboard, BROWN/WHITE wire is taped back at engine end, or it may be used for an accessory (limit 5 amperes)NOTE 2 : An accessory fuse panel may be connected at this location. The combined current draw of the primarystation and secondary station MUST NOT exceed 35 amperes.NOTE 3 : Connect wires together with screw and hex nut. Apply Quicksilver Liquid Neoprene to connection andslide rubber sleeve over connection.
A - Secondary Station1 - Stop -Start Panel2 - Tachometer3 - Oil Pressure4 - Water Temperature5 - Battery Meter
B - Primary Station1 - Ignition Switch2 - Tachometer3 - Oil Pressure4 - Water Temperature5 - Battery Meter6 - To Engine7 - 20 Ampere Fuse
4E-12 - WIRING DIAGRAMS 90-823226--1 996
Dual Station Wiring (Using A Neutral Safety Switch In Both Remote Controls)
72941
BRN/WHT
PUR
GRY
BLK
YE
L/R
ED
NOTE 3
PU
R
PU
R
GR
Y
BLK
BLK
LT. B
LU
BLK
PU
R
TAN
PU
R
BLK
RED/PUR
ORN
PUR
PU
R
GR
Y
BLK B
LK
PU
R
LT. B
LU
BLK
PU
R
TAN
OR
N
RE
D/P
UR
PU
R
BLK
NOTE 2
NOTE 3
NOTE 1
YEL/RED
YE
L/R
ED
NOTE 3 BRN/WHTNOTE 1
YEL/RED
YEL/RED
YEL/RED NOTE 3
NOTE 3
YE
L/R
ED
SEND SEND SEND
LT
LT
LT
LT
SW
12V12V 12V 12V
GND
UNSW
SIG
GND GND GND
BS
I
SEND SEND SEND
LT
LT
LT
LT
SW
12V12V 12V 12V
GND
UNSW
SIG
GND GND GND
3 4 51 2
1 2 3 4 5
7
6
YEL/RED
A
B
NOTE 1: BROWN/WHITE wire is taped back at instrument end. If installing on boat that is equipped with Mer-Cruiser stern drive, BROWN/WHITE wire is connected to trim sender terminal block. If installing on MerCruiserInboard, BROWN/WHITE wire is taped back at engine end, or it may be used for an accessory (limit 5 amperes)NOTE 2 : An accessory fuse panel may be connected at this location. The combined current draw of the primarystation and secondary station MUST NOT exceed 35 amperes.NOTE 3 : Connect wires together with screw and hex nut. Apply Quicksilver Liquid Neoprene to connection andslide rubber sleeve over connection.
A - Secondary Station1 - Stop -Start Panel2 - Tachometer3 - Oil Pressure4 - Water Temperature5 - Battery Meter
B - Primary Station1 - Ignition Switch2 - Tachometer3 - Oil Pressure4 - Water Temperature5 - Battery Meter6 - To Engine7 - 20 Ampere Fuse
WIRING DIAGRAMS - 4E-1390-823226--1 996
Dual Station Wiring (Using a Neutral Safety Switch in Engine Wiring Harness)
72942
BRN/WHT
PUR
GRY
BLK
YE
L/R
ED
NOTE 3
PU
R
PU
R
GR
Y
BLK
BLK
LT. B
LU
BLK
PU
R
TAN
PU
R
BLK
RED/PUR
ORN
PUR PU
R
GR
Y
BLK
BLK
PU
R
LT. B
LU
BLK
PU
R
TAN
OR
N
RE
D/P
UR
PU
R
BLK NOTE 2
NOTE 3
NOTE 1
YEL/RED
YE
L/R
ED
NOTE 3
NOTE 3BRN/WHTNOTE 1 YEL/RED
YEL/RED
SEND SEND SEND
LT
LT
LT
LT
SW
12V12V 12V 12V
GND
UNSW
SIG
GND GND GND
BS
I
SEND SEND SEND
LT
LT
LT
LT
SW
12V12V 12V 12V
GND
UNSW
SIG
GND GND GND
3 4 51 2
1 2 3 4 5
7
6
A
B
NOTE 1: BROWN/WHITE wire is taped back at instrument end. If installing on boat that is equipped with Mer-Cruiser stern drive, BROWN/WHITE wire is connected to trim sender terminal block. If installing on MerCruiserInboard, BROWN/WHITE wire is taped back at engine end, or it may be used for an accessory (limit 5 amperes)NOTE 2 : An accessory fuse panel may be connected at this location. The combined current draw of the primarystation and secondary station MUST NOT exceed 35 amperes.NOTE 3 : Connect wires together with screw and hex nut. Apply Quicksilver Liquid Neoprene to connection andslide rubber sleeve over connection.A - Secondary Station1 - Stop -Start Panel2 - Tachometer3 - Oil Pressure4 - Water Temperature5 - Battery Meter
B - Primary Station1 - Ignition Switch2 - Tachometer3 - Oil Pressure4 - Water Temperature5 - Battery Meter6 - To Engine7 - 20 Ampere Fuse
467 DK BLU
15A
15A
IDLE AIRCONTROL(IAC) VALVE
916 YEL J1-5 MASTER/SLAVE
461 ORN/BLK
TO ECM/BATFUSE15A
440 ORN
441 BLU/WHT
442 BLU/BLK
443 GRN/WHT444 GRN/BLK
10A
MALFUNCTION INDICATOR LAMP
DK GRN
DLC
R
BLK
INJECTOR
INJECTOR
916 YELBLK
8786853087a
4E-14 - WIRING DIAGRAMS 90-823226--1 996
EFI Wiring Diagram (Chart 1 Of 4)
(TP)
ENGINE COOLANTTEMPERATURE (ECT) ENGINE COOLANT
TEMPERATURE (ECT)SENSOR SIGNAL
A
B
C
WIRING DIAGRAMS - 4E-1590-823226--1 996
EFI Wiring Diagram (Chart 2 Of 4)
EST MODULE
ELECTRONIC SPARK TIMING (EST)
DIST. REFERENCE “HIGH”
B A
BYPASS
DIST. REFERENCE “LOW”
TO BUZZER
TO IGN
TO AUDIO WARNINGSWITCHES
TO TACH
TAN/BLU
BLU/TAN
PUR
GRY
3 PNK
121TAN
121WHT
931BRN
COOLANT OVER-TEMP (TO BUZZER)
LOW OIL PRESSURE/LOWI/O FLUID (TO BUZZER)
J1-6 TO LOW OIL PRESSURE ANDGEAR LUBE SWITCH
D
C
B
A
IGNITION CONTROL
IC MODULE
86
430 PUR/WHT
4E-16 - WIRING DIAGRAMS 90-823226--1 996
EFI Wiring Diagram (Chart 3 Of 4)
86
85
87
ECM BAT FUSE/DLC 15A
TO IGN COIL TERM B
TO FUEL PUMP RELAY FUSE 15A
TO INJECTORS
10A
SYSTEM/IGNITION RELAY
TO DLC CONNECTOR
KNOCKSENSOR (KS)MODULE
KNOCKSENSOR (KS)
439 PNK/BLK
WIRING DIAGRAMS - 4E-1790-823226--1 996
EFI Wiring Diagram (Chart 4 Of 4)
THIS PAGE IS INTENTIONALLY BLANK TOALLOW FOR CORRECTIONS OR ADDITIONS
AT A LATER DATE
4E-18 - WIRING DIAGRAMS 90-823226--1 996