Can you reword your question in more complete sentences? I can't figure out what you are saying. Are you saying that the installation kit is $75, and consistes of a fuse, some 4 awg wire and patch cables? It would depend on how much 4 awg wire and the quality of the wire. A good quality wire would cost about $3.50 a foot, a cheaper quality would be about half that. RCA cables (patch cable) generally run around $1 a foot. Fuse & holder should be around $15 So, I guess it all depends on how much wire you get in the kit. The real question is if the kit gives you enough wire to do the job. Boats often end up with a lot longer run than you would have in a typical car, plus you have to run both positive and ground wires all the way to the battery , where a car will often have a short ground wire to a nearby spot on the frame. Figure out how much wire you need before you buy the kit!
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