Description
Kit 621 Series 100A Single FT Alt MC Reg T Sensor
Kit Includes:
- 621-100-SV Alternator, MC-618 Regulator, Temperature Sensors, Mounting Hardware
621-100-SV Alternator: 100A, 12V, Spindle Mount (Single Foot), 1-2in, Single Deep Vee Pulley, Isolated Ground
1″ Motorola-Style Mounting; Typical for Westerbeke, Lehman, Hino & Pathfinder Engines
2″ Delco-Style Mounting; Typical for Volvo Penta (Gas & Diesel), John Deere, Perkins, Mercruiser, Pleasurecraft, Crusader, Indmar, Marine Power & other GM-based Engines
Replaces:
- 621-VUP-MC-100-SR-KIT
This product may not be returned to the original point of purchase.Please contact the manufacturer directly with any issues or concerns.
Specifications:
- Amperage: 100A
- Voltage: 12v
- Box Dimensions: 10″H x 11″W x 14″L WT: 16.2 lbs
- UPC: 676205000543
Brochure (pdf)

![Balmar Kit 621 Series 100A Single FT Alt MC Reg T Sensor [621-VUP-MC-100-SV]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-kit-621-series-100a-single-ft-alt-mc-reg-t-sensor-621-vup-mc-100-sv.webp)
![Balmar Alternator 120 AMP 12V 4" Dual Foot Saddle K6 Pulley w/Isolated Ground [604-120-K6]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-120-amp-12v-4-dual-foot-saddle-k6-pulley-w-isolated-ground-604.webp)
![Balmar Alternator 100 AMP 12V 3.15" Dual Foot Saddle K6 Pulley w/Isolated Ground [60-100-K6]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-100-amp-12v-3-15-dual-foot-saddle-k6-pulley-w-isolated-ground-.webp)
![Balmar Alternator 100 AMP Kit 12V 3.15" Dual Foot Saddle J10 Pulley RegulatorTemp Sensor [60-YP-MC-100-J10]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-100-amp-kit-12v-3-15-dual-foot-saddle-j10-pulley-regulatortemp.webp)
![Balmar Alternator 250 AMP Kit 12V 4" Dual Foot Saddle Dual Vee Pulley RegulatorTemp Sensor [XT-DF4-250-DV-KIT]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-250-amp-kit-12v-4-dual-foot-saddle-dual-vee-pulley-regulatorte.webp)
![Balmar Alternator 100 AMP Kit 12V 1-2" Single Foot Spindle Mount J10 Pulley RegulatorTemp Sensor [621-VUP-MC-100-J10]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-100-amp-kit-12v-1-2-single-foot-spindle-mount-j10-pulley-regul.webp)
![Balmar Alternator 100 AMP 12V 1-2" Single Foot Spindle Mount Dual Vee Pulley w/Isolated Ground [621-100-DV]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-100-amp-12v-1-2-single-foot-spindle-mount-dual-vee-pulley-w-is.webp)
![Balmar Alternator Protection Module - 48V [APM-48]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-protection-module-48v-apm-48.webp)
![Balmar Alternator 170 AMP Kit 12V 4" Dual Foot Saddle K6 Pulley RegulatorTemp Sensor [XT-DF4-170-K6-KIT]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-170-amp-kit-12v-4-dual-foot-saddle-k6-pulley-regulatortemp-sen.webp)