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500E Battery Drain Problem Persisting
This is posted as a new string, since the previous discussion was under the heading:"Shop Manual & Design Schematics."
Neil (Ke6dcj): Thanks again for your advice. The result, using my Radio Shack Multi-Meter is that the drain is a constant 1.5 amps. My car only has the simple 300E style horn honking alarm system, that was disabled once all fuses were removed from the fuse box. (I didn't figure out which one.) Thus, it turned out there was no need to wait for alarm to go through a protocol. After initially removing all fuses from the box, the 1.5A drain persisted. It still persisted after I removed: (1) the two fuses from the box to passenger side rear of regular fuse box, (2) the two barrier strip (30A fuses), one of which is in front and the other to right rear of regular box, and (3) the 15A plastic American style fuse that stands up right and forward of the fuse box. (There is no labeling for any of these fuses, so I could not correlate them with any system, other than the phone which I noticed is covered by one of the fuses in Item (1).) Incidentally, disconnecting the computer style plug from the phone box in the left side of the trunk made no difference. Interestingly, fuse "D" is not identified in the fuse box, so I have no idea what it does, although it made no difference. As I then worked in reverse putting things back to see if the drain increased, which it did not, I managed to blow up the meeter, which fortunately is only a $29 model. Looking through the prior owner's records, I noticed that his "repaired" 1st battery drain problem was traced to a lamp control unit, behind the "cluster," presumably dashboard. This was part No. MBN 004 545 08 32. His second "repaired" drain was then traced to a wire in the phone in the center console. I'm awaiting arrival of my first shop manual for this car, so I'm lacking a wiring diagram. I really don't at this point know where to look for (a) other fuses, and/or (b) un-fused systems. Any further ideas will be deeply appreciated. |
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