Quoted from pinballj:I hate to say it Nick, but if you put a coil in with diodes, I could totally see the diodes themselves shorting out the mosfet again. This could happen if the Cathode of the Diode (stripe) is connected to the drive side of the connector (Tan / Red wire). If it was wired the opposite, where the anode side is to the Tan/Red wire, I would think it would be ok.
What will happen if it was backwards, is that when the mosfet is engaged, it will not have the resistance of the coil to limit the current, and just put all of the current through the diode (0.6v voltage drop though) and the mosfet.
It sounds like you already tested the mosfet by installing a new coil and it stays engaged, or if somehow the driver wire is shorted to ground somewhere.
I hope that helps, and hopefully not too confusing!
-Jeremy
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Just pissed at myself for not noticing the difference on the coil. Same part number so assumed they were identical. Not sure why it worked for 3 weeks then decided to be a problem.
In my perfect world, I will change both the left and right Mosfets again and it will also cover my machine gunning on the right flipper as well.
Appreciate the input, truly.