Sterling 24V Alternator Protection Device
11 in stock (can be backordered)
The APD Is an “Alternator Protection Device” that works when the spike back voltage to the alternator shoots above 16.5V -> infinity (potentially) as the current has gone to 0A (to conserve P = I x V).
The APD turns on with a small resistive load of mA to reduce this escalation of voltage as a result of the break of cable that has led to 0A and V goes up up up.
If the spike is excessively rough, it can lead to APD damage (which can’t be fixed) but, your alternator / regulator has been protected.
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