I have a Bachmann Class 66 which was previously DCC fitted but the DCC decoder has been removed and replaced with blanking plug as I'm running on DC. Head and tail lights are coming on fine as soon as the wheels make contact with the track and their brightness increases as the controller power increases, but the loco doesn't move at all. Have tried oil. Removed body shell and PCB, I then found a loose red wire which looks like it goes down to the motor, the wire then came away completely as I gently pulled it. Wondering whether this is a wire that is meant to connect the PCB to the motor and could be the issue if broken?
Any thoughts appreciated. Have attached photo of the red wire after it came out.