PN8956 Datasheet, PDF (1/4 Pages) Mallory performance club – MSD RPM Activated Window Switch

MSD RPM Activated Window Switch
PN 8956
IMPORTANT: Read the instructions before attempting the installation.
Parts Included
1 - RPM Window Switch
4 - Self Tapping Screws
4 - Heat-Shrink Caps
Note: RPM Modules must be purchased separately. See the chart on the last page for part
numbers.
The RPM Activated Window Switch can be connected to stock ignition systems or MSD Ignitions.
When using a capacitive discharge ignition such as an MSD, do not connect the Switch to the
coil negative terminal. Damage to the Switch may occur.
The Switch is capable of carrying 1.5 amps. If the circuit you are activating requires more current,
an MSD Relay, PN 8960 or 8961 must be used. The MSD RPM Activated Switch is equipped with
a "smart driver". This circuit will protect the RPM Switch from damage by monitoring its temperature.
If there is an inadvertant short or too much current is drawn through the Switch, the smart driver
will sense the increased temperature and shut the Switch off. However, once the temperature
drops to a safe point, the smart driver will turn the Switch back on. It will continuously cycle On
and Off as the temperature dictates.
If you experience a problem with your Switch not operating, turn the circuit off for a few minutes to
cool, then try again. If the circuit activates then shuts off, there may be too much current flow.
Check the device's Installation Instructions to find its recommended maximum current.
The RPM Window Switch has a circuit that activates a device by providing a ground path at a
desired rpm (Figure 1). The ground will be removed at a different rpm to deactivate the device. If
no rpm module is installed, the device will remain activated as long as the rpm is above the
activation amount.
Figure 1 Operation of the RPM Window Switch.
AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN DR., EL PASO, TEXAS 79936 • [phone] • FAX [phone]