The .25 volts may be OK. The main thing is there is activity. I can't check mine today as I am driving the Diesel. The 500SEL won't be driven again until the SNOW melts and the temp gets up to a decent level. I don't have a garage at home to get in out of the cold and it is dark when I get home. Check with Fast lane, they have some reasonably priced modules that should be fine.
Paul

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84 500 SEL (307,xxx miles)