The 8905 is a 12v 94 amp delco 12si-type internally regulated alternator, a new aftermarket direct replacement engineered to match the fit, form, and function of the original alternator. Specifications: - Series: 12SI - Voltage: 12V - Output: 94 amp Confirm exact fitment with your year, make, and model before ordering. Cross-Reference / Interchange Numbers: - Replaces / compatible with: 20400, 70-01-8905, 8905. 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.