T&T: Bow Thruster

[julian garcia]

Breakers are rated in amps. Amps increase with resistance. If the breaker is
still holding its rated amperage, that means you are creating resistance
somewhere.
 Obstruction in the unit, one way or another(barnacles, string, etc). Loose
connections will raise the resistance. Bad motor will raise the resistance.
Use an amp probe to see actual amperage at the point of breaker failure. That
will tell you if you have a weak breaker, by witnessing premature failure.
Never jumper the breaker......
If the breaker is good, check wiring, then obstructions, then motor..
Good luck> From: Ownyacht at aol.com> Date: Thu, 1 Jan 2009 09:06:18 -0500> To:
trawlers-and-trawlering at lists.samurai.com> CC: Seasalt007 at aol.com> Subject:
T&T: Bow Thruster> > I have a 7hp Side Power bow thruster on my 2000 42' model
boat. I have > monthly diver services here in SW Florida. The barnacles are
not too bad this time > of the year.> > The last couple of times that I have
used the thruster for long enough to > turn the boat 360 degrees the breaker
has tripped. I always use short bursts > combined with forward motion using
the rudder rather than letting it run for the > complete turn. Also it doesn't
seem to have its normal "umph".> > The battery seems OK. It is a 3 year old
Lifeline AGM that it shares only > with the windlass (which gets very little
use). I have checked the level of gear > oil in the remote mounted fill bottle
and it is half full.> > Any ideas what is causing this? Would a weak battery
cause it to trip the > breaker? I assume that the thruster is getting hot
causing the tripping.> > Thanks> > Doc> **************New year...new news. Be
the first to know what is making > headlines.
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