Quoted from bonzo71:This is a guess since I no longer own the game or schematic. Many times these alternating features are driven by a switch on the match unit as type relay. On this game, I believe the match relay is advanced by the 100 point relay. Is the match unit advancing? If so, are there any switches on this relay that are opening/closing properly as it advances?
Hopefully someone with the schematic will confirm..
bonzo71 is right about all of that. Here's a picture of the relevant switch on the 00-90 Unit (AX, type AS) relay from the Jumping Jack manual
Pinball (resized).png