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Master Battery Cutoff Switch with Alternator Protection

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We carry the highest quality master battery switches available. This competition-proven switch is rated for 100 amps continuous duty. (See note below on how to spot a lower quality clone.)

This switch has three sets of contacts for cars with alternators. The main contacts disconnect the battery while the auxiliary contacts disconnect the ignition coil and short the alternator output to ground through a 3 ohm resistor that is furnished with the switch. A removable actuating key with splash guard, weather-proof cap, resistor and installation instructions are included. (Resistor lead configuration may vary from the photograph shown.)

Question: How do I know if I'm looking at the genuine article and not a lower quality clone?

Answer: The terminals of the genuine highest-quality switches are plated with a tin-alloy and are therefore silver colored. Lower quality clones have unplated brass terminals. In addition, genuine switches are shipped with half-height nuts while clones are usually furnished with full height nuts.

Over the years we've heard about dozens of DNF's caused by unreliable master battery switches that were purchased elsewhere. Is saving a few dollars worth risking a DNF?

Recommended accessories, sold separately:
"Off" Decal (Part No. 3356)
Master Switch Mounting Tab (Part No. 4375-001)

Wiring Instructions for 4430 Master Battery Switch

Part No.
Stock Status
In Stock


by PowerReviews
Master Battery Cutoff Switch with Alternator Protection

(based on 1 review)

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Reviewed by 1 customer

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Solid switch, easy to install

By RayM

from NYC, NY, United States

Verified Buyer

Comments about Master Battery Cutoff Switch with Alternator Protection:

Bought this for my 24 hours of lemons car. Diagram was easy to understand and installation went simply with the purchase of the mounting plate. I put it neatly in the driver a/c vent.

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