Earlier, you wrote:
> A loose clamp on a battery will also cause the hiss and create an odor.
The battery clamps on our M35 were pitted and worn. The air gaps
between the clamps and the battery posts caused _serious_ resistance
to current flow during starting. The first notice we had of the problem
was a loud " HISSSSS" and lots of smoke during startup. We shut
down the engine, switched off all electrics, and inspected the batteries
and cables. We found that we had turned one terminal into a lump of
molten lead. Had to replace the battery. Also replaced all clamps!
Dave Barbieri
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