Error code 29 - Main contactor fault

Indicates ED (main) contactor is open or short

Verify buss bar and power connections at ED contactor and traction controller.

Verify ED t contactor tips are not welded or obstructed.

Disconnect wires from ED contactor and test resistance of coil, if less than 48 or greater than 65 ohms, replace contactor. If between 48 & 65 ohms, replace traction controller.

I'd be hesitant about replacing traction controller without being as sure as possible that it was faulty.

There should be a diode or suppressor across the ed contactor, disconnect one end of it before testing resistance. Also test it for short or open circuit. Also check fuses next to ed contactor (remove them and test)