Description
Alternator 100 AMP 12V 1-2″ Single Foot Spindle Mount K6 Pulley with Isolated Ground
Alternator, 621 Series, 100A, 12V, Spindle Mount (Single Foot), 1-2in, K6 Serpentine 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: 621-100-SR-IG
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: 9″H x 10″W x 10″L WT: 13.35 lbs
- UPC: 676205750806
Brochure (pdf)

![Balmar Alternator 100 AMP 12V 1-2" Single Foot Spindle Mount K6 Pulley w/Isolated Ground [621-100-K6]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-100-amp-12v-1-2-single-foot-spindle-mount-k6-pulley-w-isolated.webp)
![Balmar Alternator 250 AMP Kit 12V 3.15" Dual Foot Saddle K6 Pulley RegulatorTemp Sensor [XT-CR-250-K6-KIT]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-250-amp-kit-12v-3-15-dual-foot-saddle-k6-pulley-regulatortemp-.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 170 AMP 12V 3.15″ Dual Foot Saddle J10 Pulley [XT-CR-170-J10]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-170-amp-12v-3-15-dual-foot-saddle-j10-pulley-xt-cr-170-j10.webp)
![Balmar Alternator 250 AMP 12V 3.15" Dual Foot Saddle K6 Pulley [XT-DF-250-K6]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-250-amp-12v-3-15-dual-foot-saddle-k6-pulley-xt-df-250-k6.webp)
![Balmar Alternator 100 AMP Kit 12V 3.15" Dual Foot Saddle Dual Pulley RegulatorTemp Sensor [60-YP-MC-100-DV]](https://www.bestmarinebattery.com/wp-content/uploads/2026/08/balmar-alternator-100-amp-kit-12v-3-15-dual-foot-saddle-dual-pulley-regulatortem.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 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)