I've been driving it around for the last while hoping it
would just plain fail. It seems to be humidty related.
On dryer days it works pretty well. When it gets
humid it starts acting up.

Today it was a dryer day and it worked flawlessly
until I took it through a car wash. While water was
spraying under the car it went off. As soon as the
attendent finished wiping it down, it came back on
(engine was running all the time) and worked flawlessly
the rest of the day.

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1995 E300D Black 170K miles