There is a little board called a solenoid expander relay under the playfield. Depending upon the activation and position of the relay, certain solenoids will fire vs others. It has a 555 bulb next to it that is necessary for it to work. I wonder if the clicking is the relay. If the relay is working — clicking when it should — then perhaps a wire fell off or there is something wrong with a connector and power is not going where it should. Check the relay for colder solder joints. Check the connector. Check the 555 board.

Here’s some info on the board I mentioned:

https://pinside.com/pinball/forum/topic/bally-special-force-solenoid-expander-board

Hmmm. I thought all 6803s had them, but I don’t really know and could be wrong. I don’t see one in the schematics or under the playfield.

What’s that little board with the relay looking thing on the right wall of your back box at the bottom?

Yeah that board is something different. I’m not sure what the issue is. Perhaps try posting a link to this thread in the 6803 club thread. There are some experts with the system there.

So that board (A084-91902-A000) is the Aux Coil Driver and the thing in the plastic cube is a relay. Perhaps it has a different name, but it serves a very similar purpose as the Solenoid Expander, it looks/sounds like.

So a voltage test is definitely a good idea, measuring from the supply lugs on each and every coil that isn't firing (to the left of the banded end of the left diode when looking at the diode side of the coil lugs). You said ohms, but I'm assuming you meant VDC (Voltage Direct Current)? And when you say they have power, how much exactly? Does it waver or stay relatively constant?

Testing for power is always a good first step. Every one of the supply lugs should read something close to +43VDC.

You mentioned that the fuses are good, but did you test them in circuit? While you usually can tell visually when they blow, I was taught to remove them when testing their continuity, to be sure you're getting a reliable reading.

If the above tests pass, then check the power at TP4 on the Power Module board. You should be getting something close to +43VDC.

Try the above and report back with your findings, please.

Measuring resistance isn’t really telling you anything since resistance of a coil is determined by the gauge of wire and number of windings.

You need to figure out whether the proper power is going to the coils.

You want to measure voltage following what vindic8r said. You need to do this with the power on, and it is high voltage so be careful. Watch a video on YouTube if you haven’t done it before. I can try to explain but sometimes a visual is much better.

Here, I haven’t had a chance to watch the whole video yet, but I think this covers the basic principle:

Great! Don’t you love it when it is a simple fix?

Nice! Kudos. Enjoy the game. It is a great one!