How many switches needed?
ARM, Heater, and a Purge
a Fourth switch would be an opener if you wanted one.
More switches would be Line Lock, or an additional stage.
Purge is wired as its own, and not dependant on the ARMing of the system, it is usually a push button momentary switch. Heater and Arm are usually toggle or rocker switches.
A heater will help you get the most out of your system as well as aid in consistancy if your playing at the track.
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