Help - Determining correct coil connectors

[dcroteau]

1991 m42 Engine Replacement under way.

There are no markings to determine which connector coming from the harness is number 1,2,3,4, to the corresponding coil & spark plug wire.

No problem getting the right plug wires identified with an ohm meter.

Anyone know an easy way to tell which connector is which.

The only way I can think of is to trace back to the ECU connector and try and figure it out there with a wiring diagram and ohm meter.

[DesktopDave]

I was trying to figure this one out for another post...unfortunately the colors are all the same on the e30, but if you pull the DME connector off, you can do a continuity test to figure out the correct wires.

According to this thread, pin 25 is coil 1; 52 is coil 2; 24 is coil 3 and 51 is coil 4.  I didn't have a picture of the connector but the pins should be labeled.