I have 2 APMs, one a genuine 3DR and one an RCTimer ArduFlyer. Both have been used with no problems on multiple multirotors within the last year or so. I moved on to PixHawk a few months ago which is what I've been mostly using but this week decided to build a new quad out of some parts I had laying around. I updated firmware and set everything up with the 3DR APM, power module and external GPS/compass, and I keep getting the Bad Gyro Health pre-arm warning. I've read every other thread I could find about this and they all say this is likely due to a blown regulator, but when I check the voltage across the I2C port it is 3.3V. I swapped out the APM for the RCTimer clone and the same thing happened with that one. Also 3.3V across the I2C port. Also worth noting that there is none of the 'drifting' horizon or heading in mission planner that other threads mentioned.
Is there anything that can cause this besides a blown regulator?
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