Replaced a fuse under the hood, now I have engine for the first time after 2 years of wiring. Makes no sense, re routed RCA, grounded RCA to head unit, wrapped wire around rcas an amp the same easy as an installer friend of mine suggested. Ground is good, sanded to bare metal, grounded to chassis. Won't go away, I'm about to tear everything out and rewire the whole thing. Anyway wtf happened?