MSD 6631 Installation
MSD 6-HVC Professional Racing Ignition
ORANGE
BROWN
GREEN
VIOLET
RED
BLACK
(+) COIL
TACH
(-) MAG
(+) MAG
(+) 12V
(-) COIL
6
5
4
1
2
3
BLACK
RED
VIOLET
ORANGE
BROWN
GREEN
with Rev Limiter
PN 6631 and PN 6632
IMPORTANT: Read instuctions thoroughly before attempting installation.
Parts Included:
1 - Ignition Control
1 - 6-Pin Deutsch Wiring Harness
1 - 2-Pin Deutsch Wiring Harness (Disable Switch)
1 - 1-Pin Weathertight Wiring Harness
IMPORTANT: Due to the MSD 6-HVC Ignition's increased output, the MSD HVC Coil, PN 8250 and
Blaster HVC, PN 8252 are the only coils that can be used with the PN 6631 and PN 6632
Ignition.
MOUNTING
The Ignition can be mounted in any position and may be mounted in the engine compartment however,
it should be kept clear of direct engine heat sources. Use the Ignition as a template to mark the location
of the mounting holes. Using a 3/16" drill bit, remove the ignition and drill the holes. Install the vibration
mounts and the ignition.
WIRING
Figure 1 shows the position, color and function of each wire. The following Figures show common wiring
schematics.
Triggering: The MSD can be triggered by points, amplifier or with a magnetic pickup.
1 - 2-Pin Deutsch Power Harness
1 - Parts Bag (4-Vibration Mounts, 4 RPM
Modules)
1 - 2-Pin Deutsch Connector
Points: The single White wire of the MSD is for points triggering. It connects to the points/amplifier output wire of the distributor.
Magnetic Pickup: The Magnetic Pickup wires are in the 6-Pin connector. The Mag positive(+) wire is
Violet, the Mag Negative(-) is Green. They are in the terminals marked "3" and "4".
Ignition Disable: This 2-pin connector provides an easy installation of NASCAR's mandated auxiliary
ignition On/Off button, 20-6.6. When the Yellow and a Black wire are connected the ignition is turned Off.
M S D I G N I T I O N • w ww .m s di gn it io n. co m • ( 91 5 ) 8 5 7- 52 0 0 • F AX ( 91 5) 85 7- 3 34 4
Figure 1 Wire Functions of the 6-pin Connector.
2 INSTALLATION INSTRUCTIONS
POINTS/
AMPLIFIER
DISTRIBUTOR
WHITE
IGNITION
DISABLE
NO SWITCH
OR SWITCH PN 8812
TO GROUND (-) HEAVY BLACK
TO BATTERY (+) HEAVY RED
ORANGE/BLACK(+)
(-) VIOLET/BLACK
GREEN (M-)
VIOLET (M+)
OR
MAGNETIC
PICKUP
DISTRIBUTOR
YELLOW
BLACK
BLACK
ORANGE
TACHOMETER
BROWN
RED
12V IGNITION SWITCH
+
PN 8250
GROUND
YELLOW
BLACK
Inset A
See
Inset A
RPM
MODUL
E
SPDT SWITCH
PN 8807
P/N
8
80
7
TO 12 VOLTS
WHITE
NOT USED
MAGNETIC
PICKUP
DISTRIBUTOR
BLACK
ORANGE
TACHOMETER
RED
PN 8250
GROUND
+
WHITE
NOT USED
BLACK
ORANGE
RED
PN 8250
GROUND
+
ORANGE/BLACK (+)
VIOLET/BLACK (-)
GREEN (M-)
VIOLET (M+)
* TO SWITCH TACH SIGNALS, MSD
OFFERS A TACH SPLITTER, PN 8911
HEAVY RED TO BATTERY (+)
HEAVY BLACK TO GROUND (-)
HEAVY RED TO BATTERY (+)
HEAVY BLACK TO GROUND (-)
IGNITION
DISABLE
NO SWITCH
OR
SWITCH
PN 8812
YELLOW
BLACK
TACH
SPLITTER
PN 8911
BROWN
Inset A
See
Inset A
See
Inset A
RP
M
MODUL
E
ORANGE/BLACK (+)
VIOLET/BLACK (-)
GREEN (M-)
VIOLET (M+)
Note: The MSD Alternate Action
Switch is designed to be used
in conjunction with NASCAR's
amendment rule regarding an
auxiliary ignition On/Off button,
20-6.6. The MSD Switch can
be used in either a Normally
Opened or Normally Closed
position.
Figure 2 General Installation.
Figure 3 Dual Ignitions and Coils with a Dual Pickup Distributor.
M S D I G N I T I O N • w ww .m s di gn it io n. co m • ( 91 5 ) 8 5 7- 52 0 0 • F AX ( 91 5) 85 7- 3 34 4
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