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  Problem Trim and Speedometer gauges

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Author Topic:   Problem Trim and Speedometer gauges
rperry posted 04-23-2003 01:32 PM ET (US)   Profile for rperry   Send Email to rperry  
Anyone have any hints on how to troubleshoot faulty gauges on a 1995 21' Outrage. Both the Speedometer and Trim indicator do not move. All cables and connections look okay. Are these gauges known to be troublesome. Is there a way to test the gauges or senders or do I just replace and pray?? I do have a GPS and FF which display speed... but I like everything to be funtioning.. See those guages pinned drives me nuts....Any suggests are appreciated.
/ Rick
lhg posted 04-23-2003 02:39 PM ET (US)     Profile for lhg    
These are both engine related issues, most likely. What engine do you have?
rperry posted 04-23-2003 10:22 PM ET (US)     Profile for rperry  Send Email to rperry     
Mercruiser Outboard - 225 HP 3.0L offshore
lhg posted 04-23-2003 11:54 PM ET (US)     Profile for lhg    
Thanks, that helps, especially since I have Mercurys also.

Mercury's trim sender on the engine is probably the problem. Mine don't work either, and they are a habitual problem on Mercurys. It is located on the engine under the transom bracket, and the engine has to be fully trimmed up to access it, on the port side. They get corroded easily, and the SS screws can freeze into the aluminum housing. A replacement sender kit is about $75., but be prepared for problems installing it unless everthing loosens freely. There is at least a 90% chance that this is where your problem is, unless a wire is disconnected at the gauge, or at the sender. I have learned to live without the information from this gauge.

As for the speedometer, assuming the water pickup on the engine lower unit is being used, they can get clogged with a splinter of wood or other debris quite easily. Most of the time they free up with use, but sometime you have to dig it out with a pin or something. On rare occasions, they are impossible to free up manually, and compressed air or something like that is needed at the dealership. All this assumes your tubing is intact. As an alternative to the engine pickup, which is by far the best solution, a separate pitot tube pickup can be installed. The speedo only works on air pressure in the tube, created by the force of water entering the pickup. It is not electrical, except for the lighting. Generally, speedometers's are quite reliable operationally, but generally aren't accurate until about 25 mph. Below that speed, the paddle wheel senders on the GPS/sonar can be calibrated to be much more accurate, even at trolling speeds.

rperry posted 04-29-2003 02:40 PM ET (US)     Profile for rperry  Send Email to rperry     
Thanks a million... some very helpfull info

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