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ContinuousWave: Small Boat Electrical
Faria Trim Gauge Reads Opposite
|Author||Topic: Faria Trim Gauge Reads Opposite|
posted 02-06-2007 11:42 PM ET (US)
I have a Faria trim guage that is acting odd. It is a new guage; the wiring is the new modular type OMC harness. I wired the gauge: white/tan to signal (S), black to (G) ground, violet to (I) Instrument/Ignition wire. When I make the connections as noted from above, and I move the trim button UP, the guage goes down, and vice versa. [Give me] a clue why the gauge acts like this?
posted 02-06-2007 11:57 PM ET (US)
I think you are saying the gauge shows the motor trimmed up when the motor is trimmed down. If so, it sounds like the gauge and the sender don't match.
posted 02-07-2007 12:06 AM ET (US)
Odd I would think that the guages are all the same.
posted 02-07-2007 12:41 AM ET (US)
The gauge has to match the sending unit, which is just a
variable resistor. There are two ways to put a sending
unit together: Low resistance is up, high resistance is down,
OR High resistance is up, low resistance is down. Looks like
Faria and OMC don't agree on how it should be done.
posted 02-07-2007 08:49 AM ET (US)
I recently experienced the same problem with a trim/tilt gauge that came in a package deal purchased on eBay.
The trim/tilt gauge that I received was for a Mercury engine and not an OMC. I contacted the seller and he sent the correct OMC gauge. Problem solved
posted 02-07-2007 09:35 AM ET (US)
The trim meter is also variable. Some have a pointer movement left-to-right and some the opposite. This is another variable. You have to match the sender and the meter. Also, on an OMC wiring harness the sender usually has an isolated ground return using a wire with BLACK with TAN STRIPE insulation. Refer to my REFERENCE article on OMC color codes at
posted 02-07-2007 01:52 PM ET (US)
I had the same issue with my old Montauk. I had an OMC engine and new Faria guages. I never could get the trim guage to work correctly so I gave up and substituted a Water Pressure guage.
posted 02-07-2007 02:13 PM ET (US)
I forgot to mention in my earlier post that the gauges involved were made by Faria.
posted 02-07-2007 03:56 PM ET (US)
If you poke around the Teleflex web site you will eventually come across a table showing the various trim senders that are around. Not only do they have differing directions (more resistance means engine up on some, and more resistance means engine down on others), but the range of ohms through which the sender moves can also different from make to make.
So even if your sender moves the gauge in the right direction, it might not linearly span it, So there are a couple of things that have to be right....
posted 02-07-2007 04:44 PM ET (US)
think i am going to get an OMC tilt gauge, then the guessing will be out of the question.
Thanks for all the feedback guys! much appreciated.
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