I have a Spirit of 76 that scores points when the ball rolls over a lit rollover, but if the rollover is unlit it will score no points. Just silence.
Any idea as to which switch stack may be the culprit?

Thanks.
I will check it out and clean and adjust as needed tonight.

Well we are onto something.
The A relay is gapped and working well.
The problem seems to be that when you roll over a lit rollover something is making that A relay stick on and buzz really loud. After you hit any working 100 point switch the A relay will return to normal. That is until you repeat this process over and over.

I have also noticed that when it locks on it is not scoring the 100 points that it should.
It will not release until anything else scores 100 points.

I have not checked for correct coil but will do so.
I know it does pull in but sometimes refuses to release until something scores 100 points.
Noticed that while in this state the pops will not score either until it fixes itself by registering a score on the 100 point score reel.
Maybe some rollover switch is stuck closed but you would think it would constantly stay broken if that was the case.

I was hopeful that I had a wrong coil or a stuck or shorted switch but no luck.
Coils are correct and all switches gapped good. No shorts on the wires either.
Arrrgh, EM’s can make you crazy sometimes.

I have now noticed that when a rollover is hit that the M relay in the backbox is staying energized.