A stuck (or in my case, broken and shorted) glow plug relay will
indeed run the battery flat with a good alternator, especially at
night when you have the headlights on. Less power produced by the
alternator than is getting used, so the battery goes flat.
Happened to me on a trip, and unlike the Benz the Volvo has an
electric shut off, so when the voltage goes too low the engine stops.
I was looking for a place to pull over where I wouldn't get hit when I
ran over a hole in the pavement and dislodged the broken contact in
the relay, instantly restoring my headlights, radio, windows, and AC.
Peter
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