
A gas Silverado runs a single battery sized for typical electrical and starting loads. Duramax diesel trucks run dual batteries in parallel to handle the higher cranking amperage diesel engines need, especially in cold weather.

On dual-battery Duramax trucks, 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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