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Message: <blockquote data-quote="sfall" data-source="post: 8574457" data-attributes="member: 673086">The head unit should already have a fuse somewhere in the wiring harness. You also need fuses on the + power cords coming off the batteries. Unless you have more components to wire, that should be all you need. All of your components, active or passive, have fuses.Since you are going to use 3 batteries, I assume you have a fairly complicated system that will demand a lot from the cars electrical system. You want to make sure things like the alternator, voltage reg, and anything similar, are high quality. Getting that setup correct will insure that you have less problems down the road.</blockquote>

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