I need to run a new power wire for my cd player. The old one is messed up somewhere, and my wiring is such a mess because of the previous owners' half-assed rewiring job that I can't even trace it. What is the best way to run a new wire? Do I just come off of a wire that comes on with the ignition or do I come off the fuse box? Also, is there an inline fuse along that wire? This probably isn't the best way to fix this, but it's the fastest and I'm tired of not having a stereo.

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82 Camaro:
350, Erson cam, ported heads, Crane Hi-6 ignition, Accel supercoil, Comp Cams 1.6:1 rocker arms, TH350 tranny with 2500 stall.
SLP 1 3/4" headers