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Now I'm kinda baffled. I started the motorhome, and the relay pulled in. I measures 12+ volts @ the coil between the coil and battery negative. After I shut the engine off, the coil was still pulled in. The baffling part is, that from the battery neg. to the coil = 0 volts. But from bat POS to the coil, I now have 12 volts. I don't get it. I'm a commercial electrician, but this 12 volt stuff throws me for a loop, sometimes.