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Longacre Battery & Alternator Disconnect Switch, no panel

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Brand: Longacre Racing Products

This NHRA-legal 4-terminal switch features an alternator interrupt circuit for cars with alternators. When the switch is turned off, the alternator exciter circuit is also cut off to prevent the alternator from feeding back into the ignition system. Wiring instructions are included. Accepts 3/8" ring terminals. Rated for 175 amps continuous current through the main terminals and 20 amps through the alternator exciter cut-off circuit. Not for use with one-wire alternators.

Wiring Diagram for Longacre 4-Terminal Battery and Alternator Disconnect Switch

We also offer a Master Battery Cutoff Switch with Alternator Protection (Part No. 4430) which re-routes the alternator output to ground, preventing damage to the alternator circuitry.

Part No.
Stock Status

Condition: New

In Stock

Great bang for the buck on the disconnect switch


The metal construction is designed to withstand heavy duty track conditions in my road race mustang. Very reliable

Russ Racer

Central California


I would buy again, and have!


You can't go wrong with any Longacre product. I run an alternator so I use the four post unit. Most tech inspections I have experienced will test your battery cut off switch to see if it will kill the engine or feed back through the alternator and keep running.


West Virginia


Longacre Battery & Alternator Disconnect Switch, no panel

5.0 2