I believe the unit on one side is the sender for the gauge. The unit on the
other side is the trim limit switch, it prevents you from tirmming the unit
into the trailer range. The trailer switch bypasses the limit switch. Both
are adjustable. But it sounds like you have a problem with the gauge sender
or gauge. An ohm meter would be helpful if you have one. Like fule tank
sending units the resitance changes as it moves. The wiring has to come in
through the outdrive so a short could cause the symptom you are seeing.
Properly replacing the sending unit includes routing the wire through the
outdrive so if it is bad you might want to take advantage of your warrenty.
Many have beed repaired by splicing though.

"WaIIy" wrote in message
...
On Tue, 04 May 2004 16:57:02 GMT, YazFan wrote:

I have a bowrider with a 300HP Merc and Bravo-1. After bringing the
boat home from dry winter storage, my trim sender seems to be faulty.
When raising the drive, the needle on the dash goes from full-in to
full-out in one qick movement as the drive is raising slowly. I'm
assuming some problem with the sender on the lower unit.

How easy is this to repair? It is a 2002 boat/engine. It may be
under warranty, but if it's easy I'd rather do it in the driveway on
the trailer than haul it to the dealer.

Bob

I'd try this......

The starboard sender is the one the gauge reads for down to about half
up.
The port sender is for half to all the way up which is for the trailer
position.
You need be concerned with the starboard sender.

Carefully mark where the sender is set before you loosen the screws to
move it. This thing is very touchy. If by moving it, you can get your
gauge to move on the dash, it's likely the sending unit has a problem.

You can take the unit apart by taking off the two screws and pulling it
apart. Mark the little disc inside carefully befor removing or you will
have problems putting it back together.
You can buy a new disc (the white disc with the carbon strip) for about
13 dollars. Put a new disc in with a little silicone grease (from
NAPA).

When you take the thing apart, it should be dry inside. If not, check
where the two wires go into the unit and also the seal around the disc
holder.

I personally think the whole assembly is cheesey, but generally easy to
fix. I've noticed problems with corrosion on the wires entering the
unit, so carefully check them out.