Ok so I am workimy on fixing a Baby Pac. The 43v to the MPU comes thru the playfield connector. That grey wire intersects the playfied where exactly? I have brown grey and blue wires going to the playfied fuse block. I have yellow grey and blue going out from the fuse block. The yellow is the 43v bus wire and I have continuity to the solonoids. But the game wont boot. If I disconect the grey wire that is conected to the switched Imum I have continuity to A4J4-15 that supplies 43v to MPU. But I dont have continuity between the yellow for thw solonoids and the grey for the illumination.

This makes total sense as to what is going on. So... The question us why wont the game boot unless I give the mpu 43v??