Philip Sim
Cadet
- Joined
- May 22, 2004
- Messages
- 6
I have a Honda 1992 45HP remote control outboard which came on the back of a 20 foot motor cruiser I bought recently. It starts and runs fine and has been well maintained. However last couple of times out, after about 20 minutes at 4500 rpm or so (planing at 20 knots) the trim warning buzzer starts. This is an intermittent warning buzzer in the RC box. After it starts it may go off occasionally for a few seconds but basically stays on until I switch the engine off. Tilting the engine up or down makes no difference. There may be a connection with hitting a lump of wood at 12 knots which I did recently, and had to replace the prop.<br /><br />Any ideas? Do I need a new trim sensor, or is the wiring faulty? The fact it only happens after 20 minutes puzzles me. Any help gratefully received.
(Haggis' engine is a 1992).<br /><br />Haggis - There's not much specific info out there on your trim alarm system for those of us who don't have the same to be able to offer specific help. You have the shop manual which is about as good as it gets, unless another member of this forum has the same set up as you and has already had to work on his. You'll just have to logically and systematically work your way through the alarm system until you find the fault. Some questions which may help narrow the search: (1) Does it always do it after 20 minutes no matter the RPM, e.g. after 20 minutes at idle? If yes, more likely an electronic/heating cause rather than mechanical/vibration (if a vibration related problem, try shaking the wire harnesses and looking for loose connections). (2) What sensor provides the engine trim level input to the trim module? Try to determine if it's providing the correct input signal. (3) What sensor provides the throttle level input to the trim module? Try to determine if it's providing the correct input signal.<br /><br />If you can verify that either of the input signals is bad, then you've located the problem; verify whether the wiring to that sensor is good and if so then adjust or replace the sensor. If both sensor inputs to the trim module are good, then your fault likely lies in the trim module itself. Hope a replacement is not too costly.<br /><br />Good luck.