INSTALLATION INSTRUCTIONS
M S D I G N I T I O N
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note:
Since the 7AL-3 is primarily a drag race ignition, the Launch limit is designed to override the
Race and burnout limits, even if the burnout limit is activated at the same time.
connecting the three Step Function
1. 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.
2. 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 launches
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. 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 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.
Whenever the 12 volts is removed from this terminal, the RPM Activated Switch
will not
operate.
Figure 8 Connecting the Three Step Module Selector.
