1966 Chevelle Temp Gauge not working ? - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 54 (permalink) Old Jul 13th, 18, 11:07 AM Thread Starter
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1966 Chevelle Temp Gauge not working ?

Hi I installed a Parts Place Gauge Cluster Dash Looks Awesome BUT my Temp Gauge is not working does it need the intake as a Ground as there is only one wire going to it ? Looks awesome But for some reason its the only Gauge that does not work ?
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post #2 of 54 (permalink) Old Jul 13th, 18, 11:26 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Did you also change the sender? If you did, possibly too much Teflon tape insulated it from ground. If you remove and ground the temp sensor wire does the gauge peg at hot?

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post #3 of 54 (permalink) Old Jul 13th, 18, 12:06 PM
 
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Re: 1966 Chevelle Temp Gauge not working ?

As stated above, the "1 prong" sending units rely on the treads/housing to ground. Too much sealant or Teflon won't allow for a good ground, therefore the gauge won't see the resistance range it's looking for.
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post #4 of 54 (permalink) Old Jul 14th, 18, 6:04 AM
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Re: 1966 Chevelle Temp Gauge not working ?

I doubt that the sender body is not grounding to the intake, but it is possible.

To check, use an ohmmeter: one probe on the body of the sender, other probe on the intake. If it reads 0 or close to it, it is grounding satisfactorily.
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post #5 of 54 (permalink) Old Jul 14th, 18, 10:16 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Painless Tech View Post
As stated above, the "1 prong" sending units rely on the treads/housing to ground. Too much sealant or Teflon won't allow for a good ground, therefore the gauge won't see the resistance range it's looking for.
If tightened enough, the threads will cut through any sealant or teflon tape and it really doesn't take that all much tightening to do it either.

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post #6 of 54 (permalink) Old Jul 16th, 18, 10:28 AM
 
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Re: 1966 Chevelle Temp Gauge not working ?

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If tightened enough, the threads will cut through any sealant or teflon tape and it really doesn't take that all much tightening to do it either.
We deal with it far more often on the tech line than you would think, to the point where we offer sending units with 2 prongs, one to go to the gauge, and one to go to a good ground source.
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post #7 of 54 (permalink) Old Aug 19th, 18, 7:48 PM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Wow as always thanks for all the tips you guys a awesome....!
I will try them in the next couple of days I have off.
I also would be interested in where I could get a 2-prong sending unit ? Just in case...!
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post #8 of 54 (permalink) Old Aug 20th, 18, 9:45 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Is there a way to check the gauge or the sending unit using a meter ?
I did get a good ground on intake from body of sending unit and all the way to the ground wire going to the battery ?
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post #9 of 54 (permalink) Old Aug 20th, 18, 10:38 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Ground the sending unit wire and with the ignition on the gauge should peg to full hot. If not, the gauge is not working or the sending unit wire is not properly connected to the gauge or the gauge is not properly grounded.

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post #10 of 54 (permalink) Old Aug 20th, 18, 10:44 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Clintsblue66 View Post
Is there a way to check the gauge or the sending unit using a meter ?
I did get a good ground on intake from body of sending unit and all the way to the ground wire going to the battery ?
You can check to make sure the sending unit housing is grounded with an ohmmeter like Geoff said.

Quote:
Originally Posted by Painless Tech View Post
We deal with it far more often on the tech line than you would think, to the point where we offer sending units with 2 prongs, one to go to the gauge, and one to go to a good ground source.
I personally don't believe it's possible for it not to be grounded if tightened in tight. If so, thousands of vehicles would need a two pronged sending unit, which they do not.

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post #11 of 54 (permalink) Old Aug 20th, 18, 11:21 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Hi Grounded the sending unit wire as suggested with the ignition on and the gauge didn't move ?
All other gauges are working and dash lights are bright I ran a separate hidden black ground wire to the gauge cluster as I know how important the ground is on these old cars. Is there away to test the temp gauge in place ? I have all new gauge dash wiring it looks like it may be leading to the gauge ?
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post #12 of 54 (permalink) Old Aug 20th, 18, 11:29 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Clintsblue66 View Post
Hi Grounded the sending unit wire as suggested with the ignition on and the gauge didn't move ?
All other gauges are working and dash lights are bright I ran a separate hidden black ground wire to the gauge cluster as I know how important the ground is on these old cars. Is there away to test the temp gauge in place ? I have all new gauge dash wiring it looks like it may be leading to the gauge ?
Connect the gauge housing or ground terminal (are we talking stock or aftermarket gauge?) to negative on the battery and the sending unit wire to positive on the battery and it should peg the needle. Don't leave it connected for more than a second or two. Use known good jumper wires as the wiring harness may be what is at fault here. If the gauge checks out then check continuity from the wire at the sending unit and the end where it connects to the gauge. If no continuity, determine where the signal is lost.

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post #13 of 54 (permalink) Old Aug 20th, 18, 11:33 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

should i test the green wire all the way back to the gauge with a meter ? there is two wires going to the gauge I took the connector off and reconected to make sure that it was a good connection didn't change gauge still didn't work ?
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post #14 of 54 (permalink) Old Aug 20th, 18, 11:43 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Clintsblue66 View Post
should i test the green wire all the way back to the gauge with a meter ? there is two wires going to the gauge I took the connector off and reconected to make sure that it was a good connection didn't change gauge still didn't work ?
Yes, that green wire should have continuity all the way to the gauge.

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post #15 of 54 (permalink) Old Aug 20th, 18, 11:44 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

The Gauges were purchased from The Parts Place as a complete assembly (after market ) total gauge cluster with speedometer.
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