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Message: <blockquote data-quote="Flipx99" data-source="post: 1306783" data-attributes="member: 562352">Crutchfield quotes:An alternative in adding multiple batteries is wiring the batteries in parallel. Parallel wiring does not require an isolator, but the first thing to consider in parallel addition of batteries is that it is absolutely essential that both batteries be the exact same type, model, and should be as close to the same age as possible.(If you add a second battery, then you also must replace the present battery in the vehicle). Adding batteries in parallel will present a single load to the alternator, so both batteries charge and discharge simultaneously.One is a old battery and one is a new yellowtop...arggghhh why can't I be like most new people and say fok the electrical system.</blockquote>

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