You should have the wiring diagram. Identify the connector by the function. The wire is going from the starter terminal 50 to the KE controller. It passes through this connector beneath the fuse panel (there are two similar large connectors there). I don't remember which side is male and which is female but both sides of the connection can be taken out (this is a ten or twelve wire junction) of their sides of the connector. On side is taken to ground (the side that goes to the KE controller), the other side has to be isolated. The way to tell which side is which is to separate them and engage the starter. The side that goes to the starter will have battery voltage on it while cranking (the other should not.

Yes, the wire from the starter side can be left out of the connector insulated and attached to nothing. It can also be left in its connector if the other side is removed. Leaving it in its hole with nothing across from it does a nice clean job. Just take the KE side out of its connector and ground it. JUST KEEP IT FROM THE STARTER SIDE.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician