"George Patterson" wrote in message
news:Q%7ff.60$N44.3@trndny08...
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Alternator problem. Possibly a filter, but my guess is a diode is going
bad.
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Diodes are solid state devices which either work, are open (most common
failure), or are shorted out (less common failure). They don't suffer from
"going bad" or "getting weak". They either work or they don't. If they are
intermittant, it's a connection, not the diode itself.

DB
(Many years of Electronics experience)