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07-24-2014, 12:13 PM | #1 |
Registered User
Join Date: May 2014
Location: Lancaster, OH
Posts: 81
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Temp Sender
So my root problem is that the temp gauge pegs hot and stays there. From my reading, pegging means there is a short to ground somewhere. I have a new gauge and a new connector for the sender. I don't believe there to be any breaks in the wire leading to the sender and have voltage to the sender.
With that said, I am having trouble with senders unless I am wrong. My old sender reads .5 ish ohms cold. 150 or so hot. After testing 3 NEW senders, from 2 different stores, they all read the same cold!!?? Shouldn't they read in the 600 range cold and as they heat up resistance goes down, giving the gauge a better ground, making the needle go to the hot side!? Thanks for the help. This truck has been nothing but problems but hopefully it is nice when it's finished... I'm getting there... Slowly... |
07-24-2014, 12:45 PM | #2 | |
Cluster King
Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Temp Sender
Quote:
It sounds to me like you meter is not calibrated correctly. The gauge should only peg if the green wire is grounded or the temp sender is shorted out internally. Also it can be shorted to ground against the tin that holds the gauge.
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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07-24-2014, 12:52 PM | #3 | |
Registered User
Join Date: May 2014
Location: Lancaster, OH
Posts: 81
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Re: Temp Sender
Quote:
Am I correct in thinking as to how it all works and the resistance the sender should show on its own? |
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07-24-2014, 01:40 PM | #4 | |
Cluster King
Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Temp Sender
Quote:
Yes, this is correct thinking. That is why I questioned your meter. The cooler the temp sender the higher the resistance value. 70 degrees F should be around 610 ohms, 212 degrees F should be around 80 ohms. If your needle is pegging, the green wire is finding ground, the sender is shorted to ground or the stud on the gauge is grounded to the tin. Try and disconnect the green wire from the sender. If you do that does the gauge still peg? This may take some trial and error to diagnose and help you figure out. Let me know what happens if the green wire is not hooked to the temp sender.
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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07-24-2014, 02:48 PM | #5 |
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Join Date: Jan 2012
Location: Whitesboro, Texas
Posts: 932
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Re: Temp Sender
Tom is correct on all counts. Let me add this to your check list:
http://67-72chevytrucks.com/vboard/s...d.php?t=545902
__________________
Cheers - Wayne Our Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=620966 '55 Wagon Build - http://67-72chevytrucks.com/vboard/s...d.php?t=689157 1971 Cheyenne Super Ochre/White LWB 350 Auto - my son's truck "Nancy" 1972 GMC K2500 Custom 4X4 Olive LWB 400 SB 4-speed -"Greenie" - Restoration to begin after the '55 Nothing sucks more than that moment during an argument when you realize you're wrong. |
07-24-2014, 02:58 PM | #6 | |
Cluster King
Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Temp Sender
Quote:
The thread you linked has great information and visuals to help. Thanks also to VetteVet for his illustrations. Take care, Tom
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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07-24-2014, 03:41 PM | #7 |
Registered User
Join Date: Jan 2012
Location: Whitesboro, Texas
Posts: 932
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Re: Temp Sender
You’re welcome Tom.
Problems like this are extremely frustrating. If our information helps one person then I think it’s worth sharing.
__________________
Cheers - Wayne Our Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=620966 '55 Wagon Build - http://67-72chevytrucks.com/vboard/s...d.php?t=689157 1971 Cheyenne Super Ochre/White LWB 350 Auto - my son's truck "Nancy" 1972 GMC K2500 Custom 4X4 Olive LWB 400 SB 4-speed -"Greenie" - Restoration to begin after the '55 Nothing sucks more than that moment during an argument when you realize you're wrong. |
07-24-2014, 06:15 PM | #8 |
Registered User
Join Date: May 2014
Location: Lancaster, OH
Posts: 81
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Re: Temp Sender
Update: I'm an idiot... lol. I didn't see the k on the volt meter... k, kilo, one thousand. .58 x 1000 =580 ohms at 80 degrees, about right. Next. Checked the resistance in the wire. 0 ohms, again, good. So I'm down to something in the dash. It looks like that thread you sent should help alot! Thanks again! I'll post back with the end result.
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07-25-2014, 10:23 AM | #9 |
Registered User
Join Date: May 2014
Location: Lancaster, OH
Posts: 81
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Re: Temp Sender
Thanks guys! Ran the ground wire that was described in Daddy'os thread and it worked like a charm!
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07-25-2014, 10:24 AM | #10 |
Registered User
Join Date: May 2014
Location: Lancaster, OH
Posts: 81
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Re: Temp Sender
Now if only I knew why all my rear lights work except the flashers... The rear turn signals work just not the flashers... Sounds like something under the dash.
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07-25-2014, 11:25 AM | #11 |
Cluster King
Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Temp Sender
Do they work on the dash or the front?
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
07-26-2014, 11:32 PM | #12 |
Registered User
Join Date: May 2014
Location: Lancaster, OH
Posts: 81
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Re: Temp Sender
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