you need to check the charging circuit to verify that you are actually charging the battery, and then you need to find what is pulling the current if it is being charged properly. Best way to do this is to get a test light and connect between the positive battery cable and the battery. IF the lamp lights, you have too much draw.

Find the culprit by pulling fuses one by one or relays -- when the lamp goes out, you've got the problem isolated.

If the seat relay is on all the time, check for a bad door swich or pillar switch -- the seats work with the door open.

If the battery isn't bad, you may have a "tired" starter drawing way too much juice.

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!