I think that's the way it's supposed to work.
Full House 9s relays (resized).jpg
Whenever the 10 point relay fires it opens the switch in the red box which will cut power to both of the 9s relays. Same thing happens when the Dealers relay fires which I think is when the ball drains.

/Mark

According to the schematic the 10 point relay fires on:
- any of the top three rollovers
- the #1 bumper relay (left or right bumper)
- carryover from the 1 point score reel

It doesn't look like there's any kind of adjustment so it sounds like getting a full house is pretty challenging.

Of course you're right. Both switches need to open to cut power to the 9s relays. Good catch.

I wondered why the 9s relays don't just reset when the Outhole relay fires and it looks like the Dealer's relay doesn't fire every time the ball drains so it seems that it's possible to carry over a pair of 9s between balls. The Dealer's relay has a pretty elaborate circuit involving the 10s score reel, the match unit and some operator adjustments. Can anyone elaborate on the rules for the Dealer's relay?