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Old 10-15-2019, 05:54 PM   #1
atars
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Default Temperature Gage reading problem

I started with the original sensor and a replacement gage. I replaced the sensor with one that reads 680 ohms cold. The gage worked. But it moves all the way to the right. The sensor was not an AC Delta unit. So I got one of those and still have the same problem. The gage does not move until I increase RPM above idle. Then it moves up like the gas gage does when filling the gas tank. It stops when I go back to idle. When I turn off the engine for a minute or two and then back on the gage remains at the left until I increase RPM.
I tried testing the gage by varying the resistance in the circuit. I removed the connector from the sensor and placed a potentiometer between that connector and engine/battery ground. I varied the resistance from 700 down to 150 ohms to see if the gage would follow my variable resistance. No movement.
Was that the wrong way to test the gage in the car?
Is there something else that I must do to ensure that there is voltage in the circuit?
Should I turn on the engine and run that test again?
I checked both of the two new sensors by heating them with a hair dryer. The resistance in both were around 700 ohms and the resistance decreased as temp increased.
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Old 10-15-2019, 06:33 PM   #2
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Is the gauge terminals wired correctly? 12 v. tan wire on the drivers side terminal and sensor on the passenger side terminal.
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Old 10-16-2019, 12:11 AM   #3
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Acardon: Almost 100% sure, but will double check again in the morning.
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Old 10-16-2019, 07:10 PM   #4
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Is the gauge terminals wired correctly? 12 v. tan wire on the drivers side terminal and sensor on the passenger side terminal.
Dark brown toward the driver door terminal and green on the other terminal. I was able to see the studs from below the instrument panel and checked the tightness of the the nuts that secure the back plate to the gage assembly.
After posting this thread, I saw the sticky on the 56 gage. Noted the problem with the grounding against the back plate.
After tightening those nuts I want to run the engine after rain stops to see if that makes a change.
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Old 10-16-2019, 11:25 PM   #5
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Old 10-16-2019, 11:28 PM   #6
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Dark brown is the generator wire. The wire should be tan. Green to sensor. Might explain why you get a reading after revving up the motor.
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Old 10-17-2019, 01:04 AM   #7
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Dark brown is the generator wire. The wire should be tan. Green to sensor. Might explain why you get a reading after revving up the motor.
I should have read Don's comment more carefully then I did. I can not see up there. So I put my finger on the post and followed the wire down to see the brown wire. I can see the tan wire in the same area.
Yes, I mentioned that the gage rises as I increase the engine Rpm.
I'm going to confirm my conclusion. If so, I hope to be able to swap the wires without having to remove the panel.
Thank for your information.
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Old 10-17-2019, 07:54 PM   #8
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Is the gauge terminals wired correctly? 12 v. tan wire on the drivers side terminal and sensor on the passenger side terminal.
Yes. Tan wire is correct. Brown is on the generator light. The generator light also flashes a little as I accelerate and the temperature gage increases movement up to the right. Any idea what can cause these indications?
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Old 10-19-2019, 12:53 AM   #9
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Is it likely that the new gage and sensors that I have are not direct replacements for the OEM parts?
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Old 10-19-2019, 09:50 PM   #10
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Yes. Tan wire is correct. Brown is on the generator light. The generator light also flashes a little as I accelerate and the temperature gage increases movement up to the right. Any idea what can cause these indications?
Check the ground wire between the generator and regulator body.
And also try a jumper cable to help ground around the temp sender body to the car body.

With a poor ground, the charging system might be trying to find a better ground via whatever circuit is a available
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