My brother's SDL has suddenly started draining batteries and eating alternators. He put a new alternator on a couple weeks ago when it stopped charging (bad diodes), but the battery kept going flat, so we swapped in a known good one. Still went down, put another alternator on because the new one stopped charging.

I was messing about with it last night, isolated the current draw with the key off to fuses #2 and #15. Alternator (last night, anyway) was putting out 14 V, so that is OK at least for now. Key off drain, no lights on, is 0.74A.

Problem is I cannot find what's sucking juice on fuse #15! Lock pump works, antenna motor isn't the culprit, it's not the lamps that run off that fuse, there is no seat belt positioner, what's left?

I've not heard anything today, so I guess it's fine with fuse 15 pulled.

Only other strange thing is that the interior light stays on after closing the door. Not the normal 15 sec or so, but indefinitely. Turned that off, but is that relay on fuse 15, and where is it?

I don't have a manual for this car, can anyone help?

Thanks!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!