Charger interface board debugging:
We are measuring 60Ohms between the 3V3 and GND connections. Where is this happening?
Test Plan:
Remove R6 to check if current leaking through the 5V, Opamps, and through D5.
Also try removing D5 if this does not make any changes.
If this fixes it, then the opamps should be fine (as the inputs are both at 0V thus there is no leaking through them), and it is something downstream causing the issues (MCP3515 or another board component).
If we are still having issues, then try removing the opamps and/or the MCP2515