TOPIC: Testing the "Overheat" switch - did I do it right?

1966 Starflite 100.

Pulled the switch for the overheat light. Indicator light on the dash works. Put the switch in a pan of boiling water with a continuity tester on the lead and the metal pan on the bottom of the switch.

And...waited, and waited and waited. Water was a rolling boil for several minutes. Nothing.

I assume the switch is toast and if it was $15 I wouldn't even bother posting this, but since it's $70 I thought I'd double check.

There is power to the switch when ignition is " on "

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On overheat it grounds to the block and completes the circuit.Alarm now is activated light or horn.

What is the part # on that switch

The Temp switch for that motor is only $70

www.marineengine.com/newparts/part_details.php?pnum=OMC0386686&ptype=&Engine=&Model=&return=%2Fparts%2Fvintage-evinrude-johnson%2F278787%2F278787index.htm

"Only $70" to you

is "70 Freakin' Dollars??!!" to me,

that's why I wanted to make sure I had tested it right.

Locating the switch is easy enough, but I wasn't going to drop the $70 if I didn't have to.

List a want ad on the AOMCI Webvertize..One of our members should have one used...got a flywheel for a 1968 55 hp for $15 shipping was near the cost of the wheel

www.aomci.org/cgi-bin/yabb2/YaBB.pl?board=Webvertize

Try using hot oil

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Reason is the set point( 211 f +- 6 f ) is near the boiling point of water 212 F at sea level.

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Depending on where you are ( elevation ) your boiling water may not get hot enuff

professor wrote:

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Depending on where you are ( elevation ) your boiling water may not get hot enuff

True enough, I'm at 3200' so that's a distinct possibility.