If you have a multi meter you could check for shorts at the 8 pin socket. With the engine off the track and the meter set to continuity or an appropriate resistance setting probe the yellow, green, white and blue pins in turn. Ideally there should be no resistance between them. Then check each of these wires in turn with the red, black, orange and grey pins. Again there should be no resistance between them. A short on the socket would be easy to remedy.
Hope this helps