I'm having an issue installing pinstadium lights into my Roadshow. I'm connecting the lights through j118 on the mpu to get gi effects, but it takes a minute or two to boot and there is nothing being displayed on the DMD. The game sometimes won't even boot unless the large ribbon cable is disconnected from the top left of the display board. When I disconnect pinstadium from j118 and attach the original it boots up normal with display. I'm at a loss of what could cause this. In either effect the game appears to play normal.

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Thanks for the suggestion, will do. Also there are only 2 wires connecting the 3 pin plugs. Is there supposed to be 3 wires? Here's some photos:

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Solved, attached it through j116 instead.