I built a smaller electronics enclosure and switched from a 24V fan (powered directly off the power supply) to a 12V fan powered by the TinyG. However, after assembling everything, I found out my TinyG is only putting out 0.7V on the fan pins - measured with the jumper is in the +12V position. When in the +Vmot position, it is properly outputting 24V as it should. Unfortunately, I cannot switch back to the 24V fan because it is physically larger and will not fit my new enclosure.
Anyone have thoughts about this? Is my regulator bad? Should I be concerned about other components being bad?
This is a V8 board that I ordered from Adafruit in October.
Thanks for the schematic and suggestion to measure there. Results: with the voltage selection jumper removed from the board, the regulator is outputting 0.74V consistently (measured across pins 2 & 3 on U8). I assume this means that I have a faulty regulator - is that correct?