One suggestion I was given on one of the other forums was to remove the 4 screws that hold it together, and clean the points on the relay inside the module.

Mine had some fairly serious buildup on one side of the points, residue from arcing over the years of operation.

After carefully using a file to clean it off, I've had no more erratic behavior or failure to turn off from mine.

I just suggest this as it costs you nothing, or at least nothing beyond the cost of a file if you don't already have one!

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...