Temperature sensor with light.

mustbereel

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May 6, 2005

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Escondido, CA

Jun 16, 2010

#1

• Jun 16, 2010

• #1

I just ordered a temp sensor for my 65 289 with idiot light and received this:


Is this the correct part? There was no sensor on this engine and all my other cars have a gauge.

Since most sensors simply sink to ground I was surprised to see two terminals. Does the idiot light require a ground or 12v source from the sensor to operate? All of the schematics I have show a single terminal type sensor. Assuming an over temp condition closes a contact between the terminals I'll just connect one to ground and the other to the light (or one side to +12v if a source is required).

 

2

2+2GT

10 Year Member

Apr 25, 2009

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Southeastern Pennsylvania

Jun 16, 2010

#2

• Jun 16, 2010

• #2

Not even close. Early 65 had the smaller one, later they had the larger one. The temp sender was the same in instrument or warning light cars.

 

mustbereel

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Jun 16, 2010

#3

• Jun 16, 2010

• #3

That's what I thought. Thanks for the info, I'll have to try again.

 

4

4tun8

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May 1, 2006

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Jun 16, 2010

#4

• Jun 16, 2010

• #4

65 cars built before september of 65 had the single pin as pictured above.

 

rbohm

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tucson,az

Jun 16, 2010

#5

• Jun 16, 2010

• #5

i believe that the sending unit you got is for cars that have a cold warning light as well as a hot warning light. my old 68 ford custom 300 had that system. it let you know when the engine was up to operating temperature. test it to be sure though.

 

mustbereel

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Jun 17, 2010

#6

• Jun 17, 2010

• #6

rbohm said:

i believe that the sending unit you got is for cars that have a cold warning light as well as a hot warning light. my old 68 ford custom 300 had that system. it let you know when the engine was up to operating temperature. test it to be sure though.

Click to expand...

Interesting. I took a closer look and one terminal is marked H, the other C. Armed with a heat gun and multimeter I tested both sides. The C terminal opened after a short time under the heat gun. The H side closed after a minute or so under the heat gun.

If it fits, It will work.

Thanks for the info.

 

rbohm

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tucson,az

Jun 17, 2010

#7

• Jun 17, 2010

• #7

mustbereel said:

Interesting. I took a closer look and one terminal is marked H, the other C. Armed with a heat gun and multimeter I tested both sides. The C terminal opened after a short time under the heat gun. The H side closed after a minute or so under the heat gun.

If it fits, It will work.

Thanks for the info.

Click to expand...

then have a little fun and hook up a cold light to go alone with the hot light.

 

Loup-garou

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New Orleans, LA

Jun 20, 2010

#8

• Jun 20, 2010

• #8

Heh, I'd forgotten all about the "Cold" light. My '66 Galaxie (first car) had one.

 

mustbereel

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Escondido, CA

Jun 21, 2010

#9

• Jun 21, 2010

• #9

Now here's the funny part. I just installed the original Falcon style instrument panel. It has a temp. gauge. I just assumed it had an idiot light because it has one for oil pressure. Doh!