Technical information

AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN, EL PASO, TEXAS 79936 • [phone] • FAX [phone]
www.msdignition.com email: [e-mail]
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The 7AL-3 shares the same wiring colors and specifications as the 7AL-2 when it comes to coil
terminals, battery supply voltage and triggering. However, the 7AL-3 has many accessories that
can be used. The following information explains their wiring and operation.
Three rev limits can be set to be activated at different times. The overrev rpm limit is active
when the other limits are not activated. The Burnout or Launch rev limits are activated when 12
volts are applied to the corresponding terminal. If both limits are supplied with 12 volts, the
Launch limit will override the Burnout limit.
Note: If no rpm module is installed, there will be no rev limit.
When 12 volts are applied to this terminal, the timing will be retarded 25° until the engine
reaches 1300 rpm where it deactivates. This can be connected to the starter solenoid to receive
12 volts when cranking or can be connected directly to 12 volts such as from the IGN terminal.
There are four stages of retard. The amounts are cumulative with a total of 20° being the max
retard. Each stage is activated when the corresponding terminal is REMOVED from ground. If a
stage is not going to be used, a Zero degree module MUST be installed or the terminal(s) must be
grounded.
Two terminals are used to make up this circuit; RAS On/Off and Output RAS. The Output RAS
terminal will supply a ground path to activate a circuit at a desired rpm (capable of up to 10
Amps). To use this circuit, 12 volts must be supplied to the RAS On/Off terminal.
MSD 7AL-3 ACCESSORIES
Three Step Rev Control
Start Retard
Retard Stages
RPM Activated Switch