"Butch Davis" wrote in
ink.net:

Larry,

More likely IMO, since you had the alternator checked by folks who
make money selling alternators, is the trim pump motor is defective.
However, if your alternator belt is old and has been slipping
(squealing) it may have become glazed and need replacement. Sometimes
adjustment is not enough for an old belt.

Belts are cheap. I'd replace mine if it is not virtually perfect if I
had the slippage you describe. I'd go from there to more complex
expensive issues. Is your tilt trim fluid reservoir full? How many
amps are being drawn by the trim motoer? How many should be drawn?
Is the switch connection perfect? Are all connections secure and free
of corrosion? Disconnect the battery and check the resistance in the
circuits going from the switch to the motor. Then check the
resistance from the batter connection to the switch. Any resistance?

Lots of possibilities but I like to go from the easy cheap to correct
to the difficult expensive to repair.

Again, good luck.

Butch
"Larry Crowe" wrote in message
...
Thanks for the info. My local marina mentioned that I may need a
rebuild or replacement alternator . I pulled the alternator and
had it bench tested under load at an automotive alternator re builder
and they said that and it seemed fine. So I guess maybe the
alternator is still really defective since I secured the belt when
reinstalling.. Thoughts ?? Larry

Butch Davis wrote:
Larry,

If the trim pump has a direct short in the motor it puts a large
electrical load on the system when used against any resistance
whatsoever. When the engine is running it would put a large load on
the alternator. If the alternator is belt driven it could well
cause the alternator belt to slip. OTOH, it could simply be that you
need a new belt or to adjust the old belt.

Good luck.

Butch
"Larry Crowe" wrote in message
...

Get a squealing noise from the water pump /power steering belt areas
whenever I trim up or down. What I noticed is that it does not
squeal when trailered out of the water just trimming off the
battery.. If I muff it with engine running I get the squeal when
trimming, don't really understand why ?? Larry




I actually had a squeal coming from the voltage regulator on an old OMC
800. It was an exernal regulator. Drove me nuts until I figured it out.
Checked all of the usual suspects (belt, pullies etc.). Long shot, but if
you have an external regulator, check it out.