John Christensen wrote:
> I would like to explain a bit more. My friends boat is old and the wires
> are a mess, coiled up all over the place. He inherited a partly finished
boat with a defective alternator.
>

> 1. Between the keyed switch and the start push button (located on either
> side of the cockpit, there are 2 cut off raw wires sticking out as well as
> a wire for the fuel pump. When he turns the key these wires come live.
> What could they be for? Does it hurt the alternator to be left on after
the engine is stopped, before he turns the key off?


REPLY
Rather than second guessing what the original owner might or might not
have intended, you are likely better of to start fresh. If the wiring is
in good shape, and run from the required point to point; you can reuse
them.  Follow the factory recommended wiring schematic and ignore the
quirks and foibles introduced by the previous owner. Maybe the cut-off
wires were used for an hour meter or maybe it was for an added instrument
now removed; or maybe . . . .   (who cares)

Use the factory schematic as your guide.

As to hurting the alternator; not not exactly.  However;  I was once
called in to solve a major corrosion problem for a big yacht dealer with
five million dollar boats for sale,  all  of them exhibiting corrosion
problems while at the sales dock and before they were ever sold. I traced
the stray current to the alternators which were permanently energized.
Because the engines were stopped, the regulator full-fielded the
alternator and the stray current dumped into the seawater via the prop
shaft. Someone had forgotten to wire the Alternator through either a key
switch or an oil pressure switch in the factory  assembly drawings. Thus
they were always  energized.  Not so much of a problem if plugged into
shore power, but would quickly flatten a battery if boat was anchored out.

regards
Arild



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