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)

what components are on fuse #12?

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1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins

Anti theft system, central locking system, courtesy lamps, rear reading lamps, power seats

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

check all of the functions associated with that fuse for normal operation with ignition on and then off and report back.

ok so after looking at the wiring diargams I disconnected 1 by 1 all the power consumers on fuse 12.

antitheft control module
central locking supply pump+ground
antitheft door switches
power seats
power seat motors
trunk lamp+coutsey lamp
checked configuration of radio
diode at x42

I had someone crawl in the trunk and i closed it and the light went out as soon I closed it. The aftermarket radio is hooked up right. I cleaned up corrison on some connectors. Still didnt drop the 200ma draw on the battery with the key off.

I was going to check the ground connections next. Any other ideas?

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

I am guessing if you disconnect the radio the draw will go away.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

already tried that still doesnt change the amp draw

checked all the grounds at w1 and nothing out of the ordinary. I found a really warm relay which happens to control the power seats.

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