Alternator Protection Module - 48VThe Balmar APM provides best-in-class surge protection using the latest technology developed for the automotive industry. Protect Alternators From Damaging Effects:Battery switch disconnectsLithium battery BMS disconnectsSurges from solenoids, combiners, starters, and other motors.The Balmar APM excels in both short-duration and longer-duration spikes, where other products fail.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.