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i believe i figured it out, the car has a koyo rad for a 3d gen outback in it and because the plugs are different the fans are wired to a switch in car, leaving the stock fan plugs wide open. Discovered the other day that the rad was leaking out of a ripped block of plug, since replacing that the issue hasn't happened. Im guessing maybe the coolant was dropping into the plug and that cause it to arc. Hopefully it holds up! thanks to anyone that post suggestion!