Merc. alarm horn frustration.
OK.. Engine is a 1991 Mercury 200 HP 2.5L. Converted to Electronic Oil injection.
When I got the engine the PO told me that the engine ran fine but then the horn started sounding whenever it was started up or at idle. As soon as you gave it some gas the horn stopped... and I found that to be exactly the case. Engine is a screamer, and I've never had any problems with it other than the horn. Water pump is replaced every other year, tattletale stream is forceful and constant. Thermostats were replaced 2 years ago. Mechanical Oil injection was replaced with an electronic oil injection system 2 years ago. Engine was lengthened from a 20" to a 25" when I hung it on the back of the V21. Cold and warm compression numbers are all within 5 lbs of each other on all cylinders.
But
The damn horn continues to sound. Constant sound as soon as you turn the key, not a series of dots or dashes. Anyone have any idea what the hell is causing the problem, or at the very least how to fix it? It's really getting to me and truthfully I don't want to trailer the damn thing down to Spare to have him fix it. (Not that I don't want him to, he's the only guy I'd trust that's semi-close by. I just don't want to make that trip twice). (once to drop off the boat and once to pick it up)
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
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