so i am attempting to build my own e pipe. so far i am using the inner cylinder from my kamry k1000 which has the battery sitting positive up. i dig the way the k1000 worked but not really its look and feel so i decided to disassemble it(after it quit on me). the one wire i see inside is supposed to attach to the spring on bottom but every video, post etc... (most of which are a coupla years old)...has the builders wiring their pipes with negative pole up. shouldn't there be at least two wires? one neg. and one pos.? i only see the red wire that goes to the spring. how do i make this work? do i need a ground wire? help please.