i seem to remember that there is a little two pin plug in the fuse box or relay box that contains a diode to separate the power on things that can be used while key off[such as radio and power seats]this may be your problem.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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