I have the same problem,usually caused by hard acceleration The ASR light comes on and the car goes into limp home mode. This is cured by restarting the car.
There are so many of us out there maybe we should petition MBNA for a fix for this.
Id also be interested in making up a harness. whats the part# . I have all kinds of teflon hi temp wire etc

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John
92 500e, 85k, silver/gray,all stock.
96 Club Wagon,Hypertech chipped( College Hauler)
97 320 SL 50k
1980 BMW e21 323 Baur conv.
1990 300GE 99k