Balmar Alternator Spike Protector

Priced: $29.99 Rated:   - 5 stars out of 5 by 1 review.
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Balmar Alternator Spike Protector -

A common electrical disaster can happen on your boat when the ignition or battery switch is turned OFF and the alternator is ON, resulting in damaged alternator diodes and lost ability to charge your batteries. The Transient Spike Protector (TSP) sacrifices itself to save the other expensive components. NOTE: Dual output alternators require a separate TSP for each positive output terminal.

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Balmar Alternator Spike Protector Review:

Reviews:

A little pricey

The widget inside the heat shrink is a Transient Voltage Supressor (TVS) Diode. At some point I opened up the equivalent item from Ample Power, found the part number, and have been just making my own every since. You can go to Mouser Electronics and search for "625-1.5KE18A-E3" and you'll find the item for about sixty cents. That, a little #16 wire, and two ring terminals and you've got a snubber. (In fact, you could make three or four and still have money left over for beer.)
Spike at WestMarine.com on 10/10/2012