Having just replaced the coil pack wires on an M104, I have the diagram right on my desk. I printed it from Alldata, which indicates that it applies to Models 124, 202 and 210. It must be the same as yours - I replaced the wires going to pins 9,10 and 21. Mine has a 44 pin connector.

First of all, I would advise against bending, twisting, turning or even unnecesarilly touching anything associated with the wiring harness. Don't even stare at it too hard. You may want to put a mirror under the connector to help you with your testing.

If you could imagine holding that connector and looking at its pins, with the cable going out the left side, the pin in the lower right corner is number 1, and the lower left is 11. Then 12 is right above 1. 44 is in the upper left corner. So 10 and 9 are on the bottom row, one column over from the cable end, and 21 is right above 10.

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