2004 johnson sensor buzzer doesnt turn off?? Help

 Grasshoppa wrote:

 Steps wrote:

Yep checked out E bay...and there are some after market ones on trademe also.

Yes checked the retifier before and when finished... all good.
The tach its self works off the rectifier circuits...generally if the tach is doing stuff it shouldnt and pole selector on the back correct, it will be the rectifier.
The workshop/ service manual is excellent for this.

kinda like i suggested in my earlier post?.........
The rectifier on these are usually pretty solid, as are the tacho's, usually
The majority of rectifier related issues (leading to rectifier/taco and/or horn issues) is usually battery/lead/battery switch issues, rectifier gets confused and outputs excessive charge and frys things/itself
While the workshop manual is good it wont tell you this, this little nugget comes from 25yrs as a marine tech and owning various versions of this motor since its inception in 1995
I currently own a 2006 edition of the same motor, last season the voltmeter on the fishfinder started reading 18-19v after approx 10-12mins of running, inspection of battery showed a cell breaking down.....replace battery and everything settled down to 14v at cruising rpm, i have absolutely no doubt that continued use would have eventually cooked the charge circuit and tacho, as i've seen before

Not saying its definitely the case for you, but dont limit yourself to what the manual says

Dont mean this to sound like a pi$$ing match but i do feel compelled to correct/enlighten you on the odd comment
Good points Grasshoppa - I appreciate your comments - I noticed on my older Merc 1988 that things seemed to go wrong more often with charging system/battery/rectifier/tacho than you would expect from using cars - the 2006 one I had last 8 yrs seemed a lot better though I blew several tacho and fish finders and then found a poorly made broken battery cable (shop that set up boat used a thick cable and lug to small for it - what they did was cut cable down to fit lug after 3 years cable broke !)   From what you are saying there could well be a problem could be a loose/corroded battery terminal/dying battery/rectifier issue which has most likely cooked tacho warning circuit - Steps how old is your battery have you load tested it/tested condition of each cell?  If battery 4-5 yrs old may be worth changing anyway as a precaution?
At least then if it happens again you have ruled that out?

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