Glad I found this post! Oddly enough my BK is doing the same thing!
(Topic ID: 102615)
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Black Knight Limited Edition
Williams, 1981
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Well that was short lived now when the ball drains it's popping the solenoid fuse! Back to the books!
Quoted from frunch:Oh man, it's always something right? Did you ever come up with the source of your problem where the fuse is blowing when the ball drains?
Actually yes! I think I'm on the trail of that as well. I had the PF and poking around with the meter just testing and looking at stuff. When I got around the pop bumper it was randomly pop. Then I wiggled the harness and it seemed like the pop bumper was laboring hard. Next thing you know the fuse popped. So I completely removed the pop bumper assembly and disconnected it all and no more blown fuses! It looked like the wires for the light were nasty coming through the PF. So I ordered pretty much everything to rebuild the pop bumper. Switch, new lamp socket, diode, coil, sleeve, and I'm going to install all that when it comes in and hopefully that was it. I played a dozen or so games since I removed the pop bumper and it's playing as it should with no popping of the 2.5amp fuse. 
It's strange playing it with no pop bumper up top! Changes the entire game around.
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