So if the dash remains powered on, but most of the sensor channels are dropping to zero, that would indicate that you may have a short or intermittent connection with the 5V power supply or the sensor ground (0V in MoTeC documentation). Does the dash continue to log data while the sensors are zero, or does the data just stop and immediately restart? If you wish to send me a logged data file (the .ld file), email to
ferg@veracitydata.com, I will be happy to take a look.
I would attempt to duplicate this in your shop, with the dash on, wiggle wires on the harness, look for places the harness may be pinched between the frame and bodywork, keeping an eye on the sensor values that have dropped to zero.