First let me say I know little to nothing about electrical stuff, so be patient with me. Last night I was hooking up some wiring (alt. wires, and battery cables) on the Z which I think I have correct. I hook up the pos. to the battery, then go to hook up the neg. cable and get a fairly strong spark (arc?). The spark is strong enough to leave marks on the post and cable. Where do I start? The battery is reading 12.6vdc.