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looking at my diagram it looks like one wire goes to the PCM (pin42) one ges to PCM (pin41) the plug looks like to goes to the + battery terminal and Volt Meter.
one goes to the power disrtubution center(PDC) then to the battery. This is the one that should be frying. The other two control the field current and that is controled by the Powetrain conrol module (PCM) and should not fry, if it does there could be a short or a problem with the PCM