MSD 7330 7AL-3 Ignition Control Installation - Manual (Page 7)

INSTALLATION INSTRUCTIONS 7
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Burnout Rev Limit:
Connect the supplied Blue wire from the Burnout terminal of the MSD to the 12 volt activation wire of
the line lock solenoid. With this setup, when the line lock is activated, 12 volts will be supplied to the
Burnout terminal which limits the rpm to your specified burnout rpm module.
Launch Rev Limit:
Connect the supplied Light Green wire to the Launch terminal of the MSD then splice it into the clutch
or trans brake 12 volt activation wire. This way, when the clutch pedal is depressed, 12 volts is applied
to the Launch terminal which limits the rpm to your specified launch rpm module.
Note: The Launch rpm limit is designed to override the Burnout limit. This way, if you activate the
line-lock on the starting line, when the Launch terminal is activated through the trans brake or
clutch switch, the Launch rpm (not the Burnout limit) will be in effect. After the car launchs the
Race rpm limit is activated to protect the engine from over revving.
RPM ACTIVATED SWITCH
The RPM Activated Switch (RAS) Output will turn on
a component such as a shift light or nitrous solenoid
at an adjustable rpm point by supplying a ground
path (Figure 11). The RPM Switch is capable of
handling a 10 amp load. If 12 volts is required to
activate the component, use an MSD Relay, PN
8960 or PN 8961.
The 7AL-3 also features an "RAS On/Off" for the RPM
Activated Switch. To use the RPM Switch, 12 volts
must be connected to the “RAS-On/Off” terminal
located at the top of the third terminal strip. When-
ever the 12 volts is removed from this terminal, the
RPM Activated Switch will not operate. This is a
useful feature for only turning on a nitrous solenoid
in high gear
by incorporat-
ing a switch
on the shifter
(Figure 12).
Figure 12 Turning on Nitrous with R.A.S. after Transbrake is released.
RAS
ON/OFF
Figure 11 Connecting the RPM Activated Switch.
7AL-3 SIDE VIEW
4500
8
°
7600
5800
4000
Zero
Zer
o
Zer
o
RPM ACTIVATED
SWITCH
HIGH SPEED TIMING RETARD
REV LIMITER
RACE #1
#2
#3
#4
BURNOUT
LAUNCH
NITROUS
SOLENOID(S)
WIRE (+)
INDICATES CONNECTION
12V
SWITCH
TWO STEP WIRE
TRANS
BRAKE
GROUND
GROUND
PUSH BUTTON
BATTERY
12 V
Zero
START