Hey folks, I have been all over this forum searching for an answer and have finally decided to post my specific problem. My 1984 300sd developed a 2.6 amp power draw over night and killed my battery. I started by removing fuses one at a time with multimeter conected and that did not show anything because the draw is actually between 2 fuses. I was only able to figure this out by removing all the fuses at once and then replace them one by one until it showed draw. I have a 2.6 amp draw on both #13 and #15 fuses. its 2.6 with the fuse only in #13 and 2.6 with a fuse only in #15 it is also 2.6 with both fuses in. This is the part that confuses me. I guess me main question is... Why would both systems show the exact same draw? Shouldn't they be totally disconnected from each other? Any thoughts would be greatly appreciated.
Just a quick refresh,
#13 controls diagnostic, hazard warning, system clock, central locking, seat adjustment memory, radio.
#15 controls trunk light, roof light front and rear, illumin, vanity mirror light, saftey belt handover arm, door lights, autom antenna, warning monitor term. 5

Thanks a lot in advance!
-Spencer

Those fuses are both "circuit 30" ie hot at all times. Something like a mis-wired radio could give the either-or fuse scenario. I'd be suspicious of :
trunk light not shutting off
automatic antenna
seat memory
central locking
radio

in that order

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Great thanks a bunch for the suggestions. I have checked the trunk light, power antenna , and it still has the stock stereo. How would I dissable the power seat memory and central locking without just removing the fuses? Thanks

Check door lights , if lens are installed 180 degrees , they could cause a short, i think they could cause a backfeed,if power terminal on lens assy is exposed,ive seen this a few times , usually blows fuse.

An alarm with dementia might also cause the problem.
Isn't central locking done by vacuum?

with three Electric Micro-Switches activating the Electric Vacuum Pump:
Driver's Door Lock
Passenger Door Lock
Trunk Lock

I would use duxthe1's list.

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'84 300SD sold
124.128