Okay, you have looked at the mag and verified that it has one wire coming off the p post. Next, now this may sound a bit weird, remove the grounding wire from the p post and wire a tempory wire and toggle switch onto the p post. and ground the wire downend from the p post to the body or engine. what you are doing is checking that there is no phantom wiring coming off that ground wire further up the loom. Try that and see what your results are. S