It happens - someone turns the battery switch to "OFF" while the engine is still running.
Even momentarily turning the battery switch to "OFF" can damage the alternator diodes leaving you without a way to charge your battery. The Zap-Stop will work to prevent that damage to the diodes. The installation is very simple - just connect the red wire with fuse to the alternator positive and the black wire to alternator ground. It is cheap insurance.

ZAP-STOP

Along with the integral 20 amp slow-blow fuse, ZAP-STOP is an ingenious device that suppresses high voltage transients by conducting them to ground if they rise to unsafe levels. ZAP-STOP helps protect alternators and electronics from damage when the battery switch is momentarily turned "OFF" while the engine is running.

Easy to install: Connect red wire with fuse to alternator positive, black wire to alternator ground

ZAP-STOP, Alternator Protector - $40
Qty.

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