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Sierra Mercruiser Alternator 18-5966 Quantity in Basket: None Code: 3054 Price: $181.95 Shipping Weight: 12.00 pounds Quantity: 12 volt/ 55 amp, single groove pulley. Replaces 12449A1, 817119A4, 98555A1, 92497, 817119A1, 12449A1, 12449.