I happen to have a book for strike master, and I was surprised to not be able to easily find a copy online.
If you have the book, this is on page 3.11.
It says that the ground signal that turns on the triac board comes on the brown/orange wire from Power board connector J129. This comes in on the Triac Board J1 pin 3. (This brown/orange wire does pass through the interconnect board, but it's a straight pass-through).
Power for the pin reset motor is the Violet/Orange wire which comes from J107 pin 2. It also drives Solonoid 9 (Pin9) and Solonoid 10 (Pin10) as well as Solonoid 11 (Pin Reset Motor)... That's what it says.
Or does it? There is some shenanigans with the interconnect board.
On the Triac Board, Pin 1 is a RED wire, supposedly, 24vdc.
Red comes from J107 pin 5. (Flasher 20v), and an asterisk says this is a direct connection to insert(???) , not through the interconnect board.
So that's where I'd look, at J107 pin 5, and it's circuitry, particularly at Fuse 111, to make sure I've got 20V (24vdc) at J107, then see how the red wire connects from there.
Hope this helps!