1996 Evinrude 150 NOT overheating

[fishing1]

I have a 96 Evinrude 150 that has started sounding the overheat alarm and the overheat light every time I start the engine. Thing is, its not overheating. The boat can sit for a week and when I start it the alarm immediately sounds. The shop manual is kinda fuzzy on this, any help would be greatly appreciated.

 

[Daviet]

Re: 1996 Evinrude 150 NOT overheating

Defective temp sender or shorted sensor wire?

 

[jonesg]

Re: 1996 Evinrude 150 NOT overheating

Disconnect the port sensor wire, see if it stops.
That will tell you if its shorted out..

 

[ondarvr]

Re: 1996 Evinrude 150 NOT overheating

The system check tach's from that era are know to go bad, many didn't last a year before doing odd things. My first one did the same thing, turn on the key and the alarm would sound, the next one the alarms work correctly, but the tach stopped working.

 

[fishing1]

Re: 1996 Evinrude 150 NOT overheating

with both the starboard and port sides disconnected the alarm still sounds?? not sure what that means. I also pulled the sensors out of the heads and the same thing happens.

thanks for the help

 

[seahorse5]

Re: 1996 Evinrude 150 NOT overheating

I have a 96 Evinrude 150 that has started sounding the overheat alarm and the overheat light every time I start the engine. Thing is, its not overheating. The boat can sit for a week and when I start it the alarm immediately sounds. The shop manual is kinda fuzzy on this, any help would be greatly appreciated.

If it is the original gauge, then that may be the problem if it is not a shorted temp switch wire somewhere. Borrow a good gauge then plug it in and see if the problem goes away.

 

[jonesg]

Re: 1996 Evinrude 150 NOT overheating

Disconnect the sensor wire AT the guage, if it keeps sounding the guage is shorted.
You might have to pull the sensor wire from the connector plug at the guage.