MrP, my point is that most people ASSUME current flows from the positive post to the negative post, which of course it doesn't! So they end up neglecting to ground the battery correctly. Direct current, DC, electron flow is like most liquids, it will take the easeist path back to the battery. Poor grounds will cause all kinds of problems, especially with solid state or semi conductor devices Hopefully my commenst will open some minds and eyes to the importance of good grounding