earl,

Did you check the powered wires only, or did you check the ground wire as well (without ground, the pump won't function either).
I think that the X48f connection is one of the two connectors at the pump (these are the only connectors near the right rear door sill as far as I can remember).

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)