Hi,

Somehow, your shaker is commanded by a transistor or a relay. You do not mention if it runs from the moment you switch on the game, or when you enter the castle when playing.

In the first case a transistor might be out and should be replaced. In the second, the shaker is started but do not stop. You should have a look to the electronic component that start your shaker.

I do not know this machine. But apparently, the shaker is activated when entering 3 modes

- Power shake on the castle entrance
- Power shake on the catapult launch
- Shakes when castle is destroyed

Is your problem based on the castle only, or the 3 situations ?

I guess you have read this carefully, but in case of, this is the mounting guide for the harness.

https://mrtn.smugmug.com/Photos/Pinball/Medieval-Madness-Shaker/i-PNm4JhF

Apparently, for each situation wires from the Shaker board needs to be attached to existing connectors. I means that another component (flasher/coil) must react at the same time as the shaker since it is activated (deactivated ?). You could check that. Maybe the added harness should be double checked.

I am trying to help without having the machine nor the shaker at home.