When used with Non-Unitized Alternators, these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running.
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![Perko Heavy Duty Battery Selector Switch w/Alternator Field Disconnect [8603DP]](http://www.dbmarinesupplies.com/cdn/shop/files/33120XL.jpg?v=1682646798 "Perko Heavy Duty Battery Selector Switch w/Alternator Field Disconnect [8603DP]")
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