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How many cold cranking amps does a 1991 ford explorer need?

There's no single CCA rating for all 1991 Ford Explorers. The required CCA depends on the engine size (4.0L or 2.9L) and the specific battery installed. The owner's manual for your specific vehicle would be the best source.

However, a reasonable range for a 1991 Ford Explorer battery would be between 450 and 600 CCA. You should check the battery itself (usually printed on the top or side) for the exact CCA rating or consult a parts store with your vehicle's information for a proper replacement battery.