JOHNSON 150hp1992

[mancity]

I have a problem with a constant buzzing noise on alarm, when engine runs for about 3 min or so.

I found the temp censor part 584152 and disconnecting the brown wire and the alarm stoped

is this a common fault with this censor or could fault be somewhere else
water is flowing through thermostats

any advise appreciated
Thanks

[boats.net]

Need to test sensor to see if bad sensor or if engine is overheating.