Temp sensor problems
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Mountain Pass
Joined: Oct 2019
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Temp sensor problems
I mentioned this a few weeks back when I was working on the steering.
I have a 1964 F-350, I get no temperature reading on the tempo gauge. All other indications work. If I ground the wire to the engine block the gauge goes to full hot. Tonight I received the temp sensor I order using the P/N to cross reference provided by Number Dummy. I tried 2 from NAPA and nothing, now this one that is specifically listed for my truck nothing. I am getting frustrated thus should be an easy fix. I have meter the wire, pulled the dash and swapped the gauges, and I can't find anything wrong at all. The probability of getting 3 duds in a row is near zero I would think. Any ideas what I am missing here.
Thanks
I have a 1964 F-350, I get no temperature reading on the tempo gauge. All other indications work. If I ground the wire to the engine block the gauge goes to full hot. Tonight I received the temp sensor I order using the P/N to cross reference provided by Number Dummy. I tried 2 from NAPA and nothing, now this one that is specifically listed for my truck nothing. I am getting frustrated thus should be an easy fix. I have meter the wire, pulled the dash and swapped the gauges, and I can't find anything wrong at all. The probability of getting 3 duds in a row is near zero I would think. Any ideas what I am missing here.
Thanks
Cargo Master
Joined: Sep 2005
Posts: 2,954
Likes: 64
I mentioned this a few weeks back when I was working on the steering.
I have a 1964 F-350, I get no temperature reading on the tempo gauge. All other indications work. If I ground the wire to the engine block the gauge goes to full hot. Tonight I received the temp sensor I order using the P/N to cross reference provided by Number Dummy. I tried 2 from NAPA and nothing, now this one that is specifically listed for my truck nothing. I am getting frustrated thus should be an easy fix. I have meter the wire, pulled the dash and swapped the gauges, and I can't find anything wrong at all. The probability of getting 3 duds in a row is near zero I would think. Any ideas what I am missing here.
Thanks
I have a 1964 F-350, I get no temperature reading on the tempo gauge. All other indications work. If I ground the wire to the engine block the gauge goes to full hot. Tonight I received the temp sensor I order using the P/N to cross reference provided by Number Dummy. I tried 2 from NAPA and nothing, now this one that is specifically listed for my truck nothing. I am getting frustrated thus should be an easy fix. I have meter the wire, pulled the dash and swapped the gauges, and I can't find anything wrong at all. The probability of getting 3 duds in a row is near zero I would think. Any ideas what I am missing here.
Thanks
Eric
Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
EricJ is referring to the instrument voltage regulator. He has recognized that because the sender, gauge, and wiring are good, the voltage regulator must be the problem. Are the other gauges working properly?
Eric
Eric
Logistics Pro
Joined: May 2015
Posts: 4,474
Likes: 974
From: Tri Cities, TN
It is entirely possible to get three bad ones in a row considering they were probably made in China or Mexico.
The best way to test the gauges is to use a 10 ohm and a 73 ohm resistor. These King Seeley type gauges just measure resistance to ground at a nominal 5 volts. It makes no difference whether it is fuel, oil pressure or temperature they all work the same.
Disconnect the sender and connect the 10 ohm resistor to ground in place of the sender. The gauge should read to the high mark. Connect the 73 ohm resistor the same way and the gauge should read to the low mark.
If the gauge passes the test the sender is bad. And if it doesn't and the other gauges are working you need to trace the wiring.
You should never ground the sender wire to see if the gauge is working because if the ICVR has gone bad and is putting out 12 volts you can ruin the gauge. Actually on later models with printed circuit instrument wiring you can burn out the entire printed circuit .
The best way to test the gauges is to use a 10 ohm and a 73 ohm resistor. These King Seeley type gauges just measure resistance to ground at a nominal 5 volts. It makes no difference whether it is fuel, oil pressure or temperature they all work the same.
Disconnect the sender and connect the 10 ohm resistor to ground in place of the sender. The gauge should read to the high mark. Connect the 73 ohm resistor the same way and the gauge should read to the low mark.
If the gauge passes the test the sender is bad. And if it doesn't and the other gauges are working you need to trace the wiring.
You should never ground the sender wire to see if the gauge is working because if the ICVR has gone bad and is putting out 12 volts you can ruin the gauge. Actually on later models with printed circuit instrument wiring you can burn out the entire printed circuit .
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