1979 evinrude 150 hp

[lilmule]

Weak sensor,replace,follow the noise to source.Annoying I know,had one that wouldnt idle thru any no wake zone,yet had plenty of water and wasnt hot.
Had a marina check it out they came back with weak sensor asked did you replace it -no duh, one can disconnect it but then would have no warning horn.
Once many of the older ones sound off unless key is turned off then back on will continue to do so.
A 1977 I have on hand acts like its on a timer will actually shut down the engine after a time,yet not hot,but only does it if raised to high and not enough water pressure,even when relowered(had it on a hydraulic jack plate) and getting enough wont shut that alarm off once its tripped,again key off then restart its reset.