Battery Master Cut-Off (Kill) Switches
We carry only the highest quality master battery switches. Don't risk a DNF with an unreliable clone.
If your car has an alternator, you must use a switch with a secondary set of contacts (such as Part No. 4430 or LA45782) to prevent the energized alternator from continuing to power the engine when the switch is turned off. Cars with total-loss electrical systems can use any of our single-circuit switches.
Note: SCCA now requires insulation on all terminals on battery master switches. Our Part No. 4435 Boots are sized to fit the main 3/8" stud terminals, and our Part No. 3929 Tape can be used on the secondary terminals of alternator switches.
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Many older race cars are set up to use a Lucas-style Master Battery Cut-off Switch, and nothing else fits properly. Our reliable, period-correct switch replaces the original Lucas perfectly.