Flipper issue is solved, Now have Row 2 Switch Row issue to solve.

My Black Knight was having issues with the lower flippers not being very strong. The linkage was badly worn. So I got a rebuild kit, replace the link, the bushing, the coil sleeve, the spring and the EOS switch, as well as put in the rubber stopper.
With the rubber stopper in place it does not give the flipper very much throw at all. with out the rubber stopper seems to give it normal throw.
But regardless of the stopper being in out not, the flipper wants to shutter when in hold and the coil buzzes. When the flipper does hold, when the ball hits it, it throws it back up. Is this a coil stop issue? Mean I need to replace the entire flipper mechanism, because the coil stop is built in?

The upper flippers have no issue and I made sure to check and clean the cabinet switches after the problem the first time and I also made sure the EOS switches are gaped correctly. (I have rebuilt bally and stern flippers so I am familiar with the process.)

I replaced the plunger also. The links are the same size center to center. I thought that could be issue and check already.

I was able to find someone else posting of the same issue. Definitely looks like the coil stop is the issue (because my bracket has the integrated stop.) So from not replacing the stop the bad end is messing up the hold. Unless it is something else entirely, but I put the old link back in and can play, just have some slop in the flippers (but new sleeves and bushings are an improvement for now.) I will order some new brackets which will have new coil stops, and see if that fixes the issue (and yes I will put new coil sleeves into the coils again when I swap the plungers).

Well, I overhauled the flippers and the brackets. Also, my old brackets where a little beat up, so I didn't mind a full overhaul (spare parts are always appreciated). Everything worked great. Then the left lower flipper stopped working, I did a bit of testing and noticed at the coil, it was not getting power. Assumed a broken wire, starting tracing the wire, turned the machine back on to see if I could get intermittent power possibly.

Now, the machine will start a game, speak the start phrase, I have a few lights that will work. The backglass lights shut off after pressing the start button, no scoring occurs, the drop targets won't stand back up, the flippers are all out, and when the ball drains, it resets the targets, and moves to the next ball (ball 2, etc) with a score of 00 showing.

This seems extremely odd and strange. I tested the CPU and it shows a clean test, and I can't find any blown fuses, I also checked all of the harnesses etc.

Ok, so after sleeping on it, and coming back to it.
I have figured out I have two issues. lower left flipper still now working. 2nd row of switches all stuck on.

I had the backglass off so I missed that the reason for the no flippers or coils working was because the machine is stuck in tilt. I ran all tests, and on the switch test found row 2 are all locked on. Switch 2 ball roll tilt, 10 left magnet button, 18 center ball ramp target, 26 lower left 3 bank target, 34 top left 3 bank center target, 42 lockup trough center.
The manual says to check for a short to ground on the row wire. Would this be someplace on the physical wire or should I expect it on the board?

As for the flipper, should I go back to my initial assumption that it is a broken wire and run a new wire from the coil to the board? the other 3 flippers all work fine (I was able to use them during the solenoid and the switch test), and I do not test any power at the flipper.

Removed the Row 2 connector, and it won't start a game at all. Checked the switched test and it only shows stuck switches for the ball trough switches where the balls are. Does this mean the board is likely ok, and someplace along the row 2 line, I have a short to ground and I am going to need to trace and find and remove? Or what is the best way to figure out the issue

For the Flipper, I found the daisy chain issue and re-attached the lose connection. and now the flipper works great! YAY, one problem solved, another problem now to figure out......

FIXED.

Thank you everyone for your time and your help.

The row issue was such a simple thing. Some had put too long of a screw to hold the diode for the ceneter ball trough. so when I noticed it was loose and tightened it, I was shorting it to the trough. loosened screw and everything works now. So I replaced with a smaller screw and everything is back to normal.

Again thank you for the help.