Alright, with a 2 prong "single" ballast it'll have a 4 pin ECU or a replacement 5 pin ECU & on them the 5th pin is a dummy (it dont go anywhere/infinity continuity). OE 5 pin ECU's have a functioning 5th pin & require the 4 prong (dual) ballast. At this point I should not have asked what "system" it has as that info ain't needed right now. Go ahead with the tests if you would & holler back when you can