SKU: CW79805
UPC: 676205751230
MPN: 621-VUP-MC-120-J10
The Balmar Alternator 120 AMP Kit 12V 1-2" Single Foot Spindle Mount with J10 Pulley, Regulator & Temp Sensor is engineered for high-output electrical demand in marine, RV, and performance automotive applications. This 120-amp alternator addresses the critical gap between factory charging capacity and modern accessory loads—dual battery systems, winches, auxiliary lighting, and inverters drain stock alternators faster than they can replenish. Built by Balmar, a manufacturer with decades of marine electrical expertise, this kit delivers reliable auxiliary charging where standard alternators fall short.
The 120-amp output represents a substantial upgrade, capable of sustaining continuous draw on dual-battery setups and vehicle-mounted equipment. The single-foot spindle mount design allows retrofit installation on vehicles originally equipped with smaller alternators, while the J10 pulley integrates with serpentine belt systems without requiring additional brackets or modification. The included voltage regulator maintains stable 12V output across varying engine RPM and electrical load, preventing battery overcharge and parasitic drain during idle periods. The integrated temperature sensor monitors alternator windings, protecting against thermal stress during sustained high-output cycles—essential for overlanding and marine environments where the system runs continuously at elevated loads.
This kit suits dual-battery system installations, marine vessels with auxiliary power demands, RVs running roof-mounted equipment, and performance vehicles with engine-mounted accessories. Compatibility depends on existing serpentine belt configuration and engine bay clearance; the spindle mount accepts vehicles with standard alternator bosses. Installation requires basic mechanical skill—alternator removal, serpentine belt routing around the J10 pulley, and regulator/sensor wiring. Professional installation is recommended for unfamiliar builders. The complete kit eliminates the need for separate regulator sourcing, reducing installation complexity and ensuring matched component performance.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
Balmar
