> I have verified that it's properly chassis grounded. Wires are
> unfortunately quite long, so I will have to look into protecting it.

Might there be a case for Schottky(s) etc on the 0V line (to V+) as
well as the measures on V+ ? To some degree the current events
on 0V will be concommitant with what's happening on V+

The very worst thing I ever made, as far as EMF is concerned, was
a butane igniter which used a PIC, HT supply and a spark plug. When
that thing went off it was noise city. Spikes were everywhere, both
through wiring and the air, really made a mess of the PIC's operation.

Took a whole day experimenting with caps, diodes, resistors, chokes,
and shields (both case and cable) to sort it out. Far worse than any
car circuit I've filtered, although it didn't suffer from major=20
low-frequency V+ or 0V excursions due to the load switching often
experienced in automotive circuits

Joe=20



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