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I know its hard for me not to, but......
When testing ohms on a temp sending unit where do I put the probes of my tester? I looked on the Youtube and all them folks have multiple wires coming out of their senders, my C3 only has one tab. I tried putting the red probe on the tab and black to a ground but got no reading (with the car running).
someone please splain this to me....go slow so I can take notes.
Rook
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you would measure from the center post to the base that screws into thew block or any other good ground
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Yup....red lead to the terminal of the sensor, and black lead to good ground. Depending on WHICH sensor you are testing, you may/may NOT get a reading. The sensor for the temp gauge SHOULD have a resistance at any given temp. If you have electric fans, the sensor will prolly NOT register until it gets to the set temp for the fan to come on...basically an on/off sensor. On the older cars, the sensor in the pass side head(two terminals) was an on/off sensor.
If you are testing the sensor in the driver side head, you SHOULD always get a reading with an ohm meter, but it will change as the temp changes.
hth
If you are testing the sensor in the driver side head, you SHOULD always get a reading with an ohm meter, but it will change as the temp changes.
hth
Joel Adams
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So what setting should I have my tester on? And then if it is a bad sensor why now, right after I changed the circuit board. My temp gauge always worked fine. So I thought.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Multimeter on "Ohms". Doesn't really matter what range...all you are looking for at this point is a change in the reading as the engine temp changes. If your meter shows "E" all the time, even with the engine hot, the sensor is no good. Just be sure you are making good contact with both the sensor terminal, and a good ground. 
Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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in Forum: C3 Electrical, Body and Interior
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