The 12577 is a 24v 120 amp alternator, a new aftermarket direct replacement engineered to match the fit, form, and function of the original alternator. Specifications: - Voltage: 24V - Output: 120 amp Confirm exact fitment with your year, make, and model before ordering. Cross-Reference / Interchange Numbers: - Replaces / compatible with: 0-120-689-516, 0-120-689-524, 0-120-689-538, 0-120-689-539, 0-120-689-550, 012-154-47-02, 012-154-50-02, 0120689538, 108922, 12577 (plus 11 more on file). Why ePartsGlobal: specialist in heavy-duty starters, alternators, and charging-system electrical parts. Backed by a 1-year warranty, free shipping on orders over $19.95, and fast fulfillment. Ships from USA.