Engine wiring harness | MINI Cooper Forum Feb 11, 2009In addition I also have the ECU, EWS box and KEY to match, however as the new engine came out of a 2004 MCS the main engine wiring harness seems to be different (this is the plug located on the passenger side of the car) My cooper harness has 8 wires and the new cooper s engine has 10 and the plug is a different size. Mini Cooper Wiring Problems - Car Problems, Statistics Mini Cooper owners have reported 15 problems related to wiring (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mini Cooper based on all problems reported for the Cooper.
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