Hi, we tried disconnecting the red wire from one of the ESC and it didnt make an improvement, it also meant that the ESCs werent synced as we had to urn both on individually. The ESCs LEDs seem to flash really randomly, not in sync when the throttle is pressed, is this normal. There the pics from the reciever box, with the Y lead and bits.
1. Your batteries in parallel?
2. Y harness. If you can, try switching the leads and rule out bad connection Example, if (esc,yharness branch) ESC1-1 and ESC2-2 and ESC1 works. Try ESC1-2 and ESC2-1. If ESC2 works, your harness is fine. IF it dont harness is bad.
3. Do both respond to calibration?
3. wire everthing BUT the motor and see if both LEDs respond.