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Hi everyone! Great guide. I am only confused by the (+) and (-) terminals on the battery in the diagram? I would have thought batt NEG would be the common ground.Anyway, my application is for an air pump on AC mains.I have modified the diagram to my setup. Only not sure about one thing:Should the phase (EU brown colour) wiring pass through the relay, or should it be the neutral (EU blue colour) that passes through the relay?According to my interpretation, the air pump and mains should be:-connected via NO/COM on the relay, via wire A, and-directly wired via wire BJust not sure if it makes a difference. My gut is saying Wire A= Phase, Wire B = Neutral.Maybe it doesn't make a difference? Hope someone can help.Supercosm