
A gas Ram 1500 runs a single battery for typical electrical and starting loads. Diesel Ram 2500 trucks run dual batteries in parallel to handle the higher cranking amperage Cummins engines need, especially in cold weather.

On dual-battery Ram 2500 diesels, always replace both batteries together — mismatched age and capacity strain the healthier battery and shorten its life.

A weak alternator can mimic battery symptoms. Load-test the battery and check charging voltage together before replacing parts unnecessarily.
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