Hi, I have taken a couple of pictures from my Hi Deal. First the schematic:
Shows that the Double Bonus relay pulls in when you roll over the lane switch plus certain numbers on the 00-90 disc (in back box). Its then kept in by switch on its own relay, and released when ball drains
So, I wonder if you have the little jones plug inserted?
Here's mine in the "Norm" position (its the one on the left)
Its in the back box. As is the key to the settings:
Hope that helps?