When relocating the battery to the boot (or tray in my case) is a short cable from the neg battery terminal to the body sufficient grounding for a CA18 for starting etc? I'm not sure if I should run a neg cable to the starter from the battery or if I can get away with only 1 pos cable running to the engine bay and use a second earth to the block. I'm interested to see what others have done and your experiences. Cheers.