Temp guage not working
Senior User
Joined: Sep 2003
Posts: 364
Likes: 0
From: Hartland, MI
Ground the wire that hooks to the sending unit and the gauge should read way over towards the hot side. If not the problem is in the wiring/cluster/gauge. If it does most likely you have an issue with the sending unit.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Now you mention the gauge 
I thought the concern was the pulsing current ?
Under what circumstance did this gauge read this.( Engine Hot,cold ,etc)
Make sure there isn't a whole bunch of teflon tape on the threads.
Some tape causes continuity problems.
The measuring is done by GROUND OUT of the S/U.
If it can ground out properly it won't read very high.
With the key on and the wire to the S/U directly to ground...what did the gauge do ?
Save your money for now on an S/U.
ps, Find a sealant that is made for sending units.
I think Permatex is one.
I thought the concern was the pulsing current ?
Under what circumstance did this gauge read this.( Engine Hot,cold ,etc)
Make sure there isn't a whole bunch of teflon tape on the threads.
Some tape causes continuity problems.
The measuring is done by GROUND OUT of the S/U.
If it can ground out properly it won't read very high.
With the key on and the wire to the S/U directly to ground...what did the gauge do ?
Save your money for now on an S/U.
ps, Find a sealant that is made for sending units.
I think Permatex is one.
Senior User
Joined: Mar 2004
Posts: 103
Likes: 0
From: Cincinnati
I have a 79 F150, with the same problem. As was said before, the best way to issolate the proplem is to unplug the wire to the temp sensor and ground it. While doing so, have someone watch the meter, perferable some cute young thing. Not that it makes a difference on the reading, it just makes test that much more fun. Hey, you may want to check that out a few times.
Anyway, if the temp gage heads for hot, the wiring and gage are good, the sensor neews to be replaced. I just purchased one at the local Autozone for $17. If you find somewhere cheaper please let me know.
From the looks of it, you may have to remove the fan, and alternator bracket to get it in and out.
John24255
Anyway, if the temp gage heads for hot, the wiring and gage are good, the sensor neews to be replaced. I just purchased one at the local Autozone for $17. If you find somewhere cheaper please let me know.
From the looks of it, you may have to remove the fan, and alternator bracket to get it in and out.
John24255
Last edited by John24255; Jan 28, 2005 at 01:21 PM.
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Freshman User
Joined: Nov 2004
Posts: 41
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I got it to work thank you for everyones input it was the sending unit i thought it was that but i just wanted to find out about the pulsing mostly.and sorry for the spelling of gauge i need to pull my head out.
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