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Message: <blockquote data-quote="Full Tilt" data-source="post: 8161544" data-attributes="member: 640249"><p>It's not designed to. Your vehicle's alternator is only designed to maintain 1 battery's voltage - the one under your hood. It's going to affect charging when you hook it up to two batteries, but people do it regardless. In fact, I'm going to. However, even if you're only dipping into the 13s, dimming can still be a problem. Voltage drops affect all vehicles differently, and some is hard to get rid of without even the best electrical system. My advice - figure out how low your voltage is falling, and we'll be able to help you a little better.</p></blockquote><p></p>

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