Water temp gauge problem.
Thread Starter
Race Director
Joined: Jan 2002
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From: No Where USA
Water temp gauge problem.
I installed a new printed circuit on my 1980 for the gauges, They all work fine except the water temp. It worked fine before I changed out the printed circuit now it seems to stay around 250 degrees. Does someone have a picture of the back of the gauge panel so I can compare it to mine.
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From: No Where USA
Thread Starter
Race Director
Joined: Jan 2002
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From: No Where USA
It's under it. It has to be a wrong nut in the wrong place. Everything worked before the new printed circuit.
Thread Starter
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From: No Where USA
I removed the nut and now it just reads 100 degrees. I tried the old board but it is screwed up where the plug goes in so that wasn't any help.
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From: Dayton, Ohio
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From: Dayton, Ohio
Thread Starter
Race Director
Joined: Jan 2002
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From: No Where USA
Thread Starter
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Joined: Jan 2002
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From: No Where USA
I have 12 volts at the top screw, 12 volts at the bottom, signal screw.
Do you nthink I cooked the gauge by putting the nut on the 9 o clock lug.
That put 12 volts to both sides of the resister.
Also when the key is on the needle moves to the left a little, as soon as you put the key on it sits at 100.
Do you nthink I cooked the gauge by putting the nut on the 9 o clock lug.
That put 12 volts to both sides of the resister.
Also when the key is on the needle moves to the left a little, as soon as you put the key on it sits at 100.
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From: No Where USA
If you look at my post above I did remove the nut at 9 and insulated it so that part isn't touching the printed circuit.
The problem is still there. Do you think I fried the gauge because I had that nut on at 9.
Everything was working before I did the printed circuit. So the gauge might have cooked.
Racer
Joined: May 2007
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From: Cherry Hill N.J.
I just checked my car and with the key ON the temperature gauge IS at about 100 degrees.............start the engine and see if the gauge responds as it warms up......
I believe your gauge is working properly......
I believe your gauge is working properly......
Thread Starter
Race Director
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From: No Where USA
I tried that and it didn't move. But I only let the car run for about 15 minutes.
I will look at it tomorrow. Thanks.
Advanced
Joined: Sep 2006
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Ground is full hot.
The gauge registers with high resistance at low temperatures and low resistance at high temperatures. I recommend you put an ohm meter on both sides of the back resistor and confirm that you are getting 90 ohms resistance. If it's not reading you may have a loose or bad connection where the plug goes into the back of the circuit board.
Be advised that even when you get the wiring squared away the gauge is about as accurate as a hand grenade. When my gauge reads about 220 its actually 195 on the engine as checked by a thermocouple and I do have the correct temperature sensor.
The gauge registers with high resistance at low temperatures and low resistance at high temperatures. I recommend you put an ohm meter on both sides of the back resistor and confirm that you are getting 90 ohms resistance. If it's not reading you may have a loose or bad connection where the plug goes into the back of the circuit board.
Be advised that even when you get the wiring squared away the gauge is about as accurate as a hand grenade. When my gauge reads about 220 its actually 195 on the engine as checked by a thermocouple and I do have the correct temperature sensor.
