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So, if you are seeing around 3v out, that is a major problem. The 12v low voltage lockout would be happening, which would stop the pwm from making it out to the motor. There could be a solder bridge, or the cincon could have just failed for some reason. I'd check for solder bridges, when solder crosses over the isolation gap and touches what it shouldn't touch. If you have a solder sucker, you could suck the solder out of the output holes, and then give it power to see if you can get 12v out of it.
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