I had the same fuse blowing on my Mousin Around when I first got it. It ended up being an issue on one of the boards. I sent out the main board and driver board to be tested and repaired. I don't exactly know what was done but it solved the problem.

Is this on the power supply or aux power supply, since you are checking coils then I think it's the aux power supply. Why don't you try putting in a new fuse and then go to coil test and repeat at each of the 50volt coils while watching the fuse. When you get to the bad coil you will see the fuse pulse and glow as the coil fires. This should narrow it down to which coil circuit to check.

Now I see you have AUX in the title....

Nice find!

You need to replace the diodes on the aux power supply for these bad coils too.

I have found that when a coil locks on even for a short time a large amount of current flows thru the coil in excess of 10 amps. This over stresses the diode and if it goes bad it will ruin the driver, predriver and the new coil your installing. In my opinion it not worth .07 cents and 5 minutes of your time to replace.

Need help, i now have 2 weak coils. I was fixing the right one and during testing the left on is now in the same situation the right one was in. I check cold solders, re did them all, cleaned and replaced coil sleeve, repleced a bad eos swtich (all for the right), and now i am out of ideas. Both flippers are now weak, (no gusto from the high voltage end) buy holds in place when low voltage kicks over. Any help would be appreciated. I dont know where to go from here.

maybe start a new thread?

possibly the EOS switches are not making good contact?

try removing a wire from each and measure continuity/resistance across the switches?

even new EOS switches need a good clean and check with a meter to confirm zero ohms across switch.