1976Grand Prix - when ball leaves playfield i receive no score at all on reels, lights count down like supposed to and everything resets normal but "no score" is added to reels from left or right side when lane is lighted ,(neither one)What controls this bonus to be added to reels ? Also the lock relay Z-29-1250, in the in bottom cabinet board (last position in back right) stays energized as soon as machine has power. I have unhooked it and doesn't seem to do anything, what is this for and do i need it or can i just zip tie it and leave unhooked ? picture included, i know i broke it but don't want to replace unless i have to.

gp relay (resized).jpg

Thanks for info but when lock switch is working or not game over relay works fine, doesn't seem to do anything.
Also both left and right bonus work just doesn't add any score when counting down on either side when lighted. can't figure what it uses to send Paulse to score reels to get any score points.