1964 Evinrude 75 hp, temp light/horn

Evinrude Boater

Evinrude Boater

Lieutenant Junior Grade
Joined
Jul 6, 2004
Messages
1,144
I believe this engine has a temperature sensor on one of the heads with a brown wire. I would like to hook it up to make it functional. Does it complete an electrical circuit by connecting to ground when the sensor triggers? I have a temp horn from a Sea-Doo. Can I install that instead of a light that I likely won't see?
 
F

freddyray21

Commander
Joined
Jun 10, 2006
Messages
2,460
Re: 1964 Evinrude 75 hp, temp light/horn

I believe it does complete the ground when it overheats. You should be able to hook the ground of your horn to the sensor wire and the hot wire to a good 12v source and if it over heats the horn should go off.
 
F

freddyray21

Commander
Joined
Jun 10, 2006
Messages
2,460
Re: 1964 Evinrude 75 hp, temp light/horn

If I recall there should be a brown wire in the harness going to the key switch that runs back to the sensor. I would need to look in my manual to be sure
 
Evinrude Boater

Evinrude Boater

Lieutenant Junior Grade
Joined
Jul 6, 2004
Messages
1,144
Re: 1964 Evinrude 75 hp, temp light/horn

There's no sense having it hooked up if the sensor is defective. Is there any way to test the sensor?
 
F

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: 1964 Evinrude 75 hp, temp light/horn

Not without removing it and putting it in hot water. You have to remove the water cover plate to get it out. So, ok let's suppose you do all that and it works. Does that mean it will work NEXT time? I find that they are very unreliable. In fact I have rebuilt dozens of powerheads that cooked before the horn ever went off. Your best insurance is to make sure you have a good fresh unworn water pump and then turn your attention to something more enjoyable.
 
Evinrude Boater

Evinrude Boater

Lieutenant Junior Grade
Joined
Jul 6, 2004
Messages
1,144
Re: 1964 Evinrude 75 hp, temp light/horn

Maybe I should get the generator belt instead so that it charges the battery since I fried my battery charger bench testing the starter. At least I don't have any "problems" with this boat and motor. You can probably tell I'm never satisfied just sitting around. I want to find something to do. I guess that's why I don't fish. Too much sittin' Hmmm, there's my 40hp sitting in the garage with the flywheel still stuck to the crank shaft. I'll go see if I can get that bugger off.
 
You must log in or register to reply here.
Top