I am experiencing a battery drain on 1991 190E 2.6. Ive searched the forums and unfornately not too many had solutions.

I measured the draw at the battery by disconnecting the postive lead and connected my multimeter and found out the draw. It was .26 amps.
What should the value should be?

I then started pulling fuses until I isolated the fuse that was draining the battery. It happens to be fuse #12.

How do I go about diagnosing the problem when I have isolated it?

forgot to add BRAND NEW battery and the alternator is charging the battery.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)