Alternator Protection Module – 48V
The Balmar APM provides best-in-class surge protection using the latest technology developed for the automotive industry.
Protect Alternators From Damaging Effects:
- Battery switch disconnects
- Lithium battery BMS disconnects
- Surges 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.

![Balmar Alternator 100 AMP 12V 1-2" Single Foot Spindle Mount J10 Pulley w/Isolated Ground [621-100-J10]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-100-amp-12v-1-2-single-foot-spindle-mount-j10-pulley-w-isolate.webp)
![Balmar Kit 621 Series 100A Single FT Alt MC Reg T Sensor [621-VUP-MC-100-SV]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-kit-621-series-100a-single-ft-alt-mc-reg-t-sensor-621-vup-mc-100-sv.webp)
![Balmar Alternator Vortec K6 Serpentine Pulley RegulatorTemp Sensor - 170A - 12V [XT-VT-170-K6-KIT]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-vortec-k6-serpentine-pulley-regulatortemp-sensor-170a-12v-xt-v.webp)
![Balmar Alternator 120 Amp 12V 1-2" Single Foot Single K6 Pulley w/Isolated Grounding [621-120-K6]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-120-amp-12v-1-2-single-foot-single-k6-pulley-w-isolated-ground.webp)
![Balmar Alternator Protection Module APM24 - 24V [APM-24]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-protection-module-apm24-24v-apm-24.webp)
![Balmar Alternator 170 AMP 12V 4" Dual Foot Saddle K6 Pulley [XT-DF4-170-K6]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-170-amp-12v-4-dual-foot-saddle-k6-pulley-xt-df4-170-k6.webp)
![Balmar Alternator 120 AMP 12V 3.15" Dual Foot Saddle Dual Pulley w/Isolated Ground [60-120-DV]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-120-amp-12v-3-15-dual-foot-saddle-dual-pulley-w-isolated-groun.webp)
![Balmar Alternator 170 Amp, 12V Single Foot Internal Regulator K6 Pulley [XT-SF-170-IR]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/balmar-alternator-170-amp-12v-single-foot-internal-regulator-k6-pulley-xt-sf-170.webp)