That is connector C106.
You need the wiring diagram documentation from the service manual and an ammeter (and the knowledge to use it) to track this down.

Alternatively, see my next post for some hints. The fact you have noise that goes away when you disconnect it is pretty good indication that you are very close to the culprit.
For the battery to hold up five or six days, I'm surprised, since the likely culprits would often flow more current than that!