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Message: <blockquote data-quote="GreenBook" data-source="post: 5255350" data-attributes="member: 603834">The fuse you use in the power wire depends upon the amp or amps you are going to be running.  Using a fuse that is rated larger then the maximum output allows the amplifier to drain energy from the battery above and beyond what the alternator can produce.In your case though, a 300 amp fuse is way larger then what you should be using for a 1500w rms amp.  You'd have to tell us what specific amp you are going to use, but a 'true' 1500W rms shouldn't need fuses bigger then roughly 110-120 amps.  1500(W)/14(V)= 107(A).If you plan on running a second amp, say for your high notes, the fuse closest to the battery needs to be cumulatively larger the the amps' your running demands.  Where you split the wires to their individual amp needs to be rated for its respective amp.</blockquote>

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