damage to alternator or electrical system. AFD is required on some electrical systems. Heavy duty copper sweep contacts "Make before break" contacts allow selection of all positions except "off" while engine is running Use with 6, 12, 24 or 36 volt systems New design is easy to retrofit into existing hole patterns Built-in skirt protects connections Exclusive flat 360 degree "sweep" contact design provides up to 60% more contact area than other switch designs Surface or rear panel mounting Marine grade construction One year warranty  (less)