Jim,
I totally agree with Mike on the relay. Also if you have owned the car for 10 years and know the pumps haven't been changed, do yourself a favor and change the pumps too. I know they are expensive, but trust me they are due for failure, and you don't want to put your wife at risk. You have to look at it this way. You are driving one of the finest MBs ever built for cheap, so you can afford to put a few bucks into the car. The pumps will cost less than two car payments on a new piece of crap. Actually if your pumps are drawing alot of current, they will take out your new relay.

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