1966 Chevelle Temp Gauge not working ? - Page 2 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #16 of 54 (permalink) Old Aug 20th, 18, 12:03 PM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Just checked the green wire all the way to the terminal that connects to the gauge from the sending unit connection with a meter it is a good connection.
I also checked ground from the housing of the temp gauge cluster to a know ground and that was also good !
It's leading me to believe that the new gauge its self is faulty ?
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post #17 of 54 (permalink) Old Aug 20th, 18, 12:26 PM
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Re: 1966 Chevelle Temp Gauge not working ?

Have you checked the pink wire at the gauge for 12 volts with the key in the run position? If the pink wire has 12 volts, The green wire to the sender should also have 12 volts when disconnected from the sender. If not, the gauge is faulty.Also the sending unit is a variable resistor for a gauge setup, whereas the sender for a warning light setup is simply a switch to ground to illuminate the light. As you can see, these are not interchangeable.If you have an ohmeter, connect one end to the wire terminal of the sending unit and the other wire to the body of the sender and see if you get a resistance reading other than open. If you get an open reading you have the wrong sending unit.

Last edited by modern malibu; Aug 20th, 18 at 12:48 PM.
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post #18 of 54 (permalink) Old Aug 20th, 18, 12:59 PM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

I will try that tomorrow I am off to work for the evening..
I Just checked quick while the Engine was still hot yes I do have resistance so the sensor is good !
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post #19 of 54 (permalink) Old Aug 21st, 18, 5:18 PM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Hi I did check the pink wire it does have power....! I then checked the green wire after disconnecting from post of sensor and plugging connector back in to gauge with key turned to run. NO Power at green wire where it would plug on to sensor with key on ! looks like the gauge is no good ?
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post #20 of 54 (permalink) Old Aug 21st, 18, 7:29 PM
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Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Clintsblue66 View Post
Hi I did check the pink wire it does have power....! I then checked the green wire after disconnecting from post of sensor and plugging connector back in to gauge with key turned to run. NO Power at green wire where it would plug on to sensor with key on ! looks like the gauge is no good ?

**Removing what was apparently an inaccurate bit of information. Please refer to the post by Coppertop below!**

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post #21 of 54 (permalink) Old Aug 21st, 18, 8:37 PM
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Re: 1966 Chevelle Temp Gauge not working ?

Isnt it 12v at the gauge and the sender changes resistance to ground based on temp? If so make sure you have 12v at the gauge.


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post #22 of 54 (permalink) Old Aug 22nd, 18, 12:10 AM
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Re: 1966 Chevelle Temp Gauge not working ?

If the connections are good, you will see voltage on the green under hood wire with it disconnected from the sender (of course the key has to be on).

This is because a voltage divider is formed between the sending unit and the gauge assembly. So with an open ( green wire disconnected from the engine sending unit, your red probe of your voltmeter touching the green wire connection only and the black wire of your voltmeter to a GOOD ground), you will see some voltage with the key on.

In an earlier post you claimed you had continuity from the very end of the green wire at the engine side all the way back to the green connector at the dash/gauge end. If this is true, and the gauge has both power and ground, then signs point to a bad gauge.
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post #23 of 54 (permalink) Old Aug 22nd, 18, 7:09 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Is there away to check just the gauge ?
I have power to the gauge pink wire, and I have good continuity on the green wire from sensor disconnected to the gauge disconnected.
So every thing electrical is there as it should be and working to me it is pointing to the gauge ?
Can I use a meter to somehow check the gauge ?
If I do a continuity check across the gauge It should not read open correct ?
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post #24 of 54 (permalink) Old Aug 22nd, 18, 7:32 AM
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Re: 1966 Chevelle Temp Gauge not working ?

Might depend on guage internal circuit. ( diodes?)
Quote:
Originally Posted by Clintsblue66 View Post
Is there away to check just the gauge ?
I have power to the gauge pink wire, and I have good continuity on the green wire from sensor disconnected to the gauge disconnected.
So every thing electrical is there as it should be and working to me it is pointing to the gauge ?
Can I use a meter to somehow check the gauge ?
If I do a continuity check across the gauge It should not read open correct ?
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post #25 of 54 (permalink) Old Aug 22nd, 18, 10:09 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

I did check across gauge terminals and it did show conductivity ?
Now I am really puzzled....? I was hoping it would show open that way I would figure it as a broken / open circuit.
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post #26 of 54 (permalink) Old Aug 22nd, 18, 11:03 AM
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Re: 1966 Chevelle Temp Gauge not working ?

I had to bypass the green wire on my 67 and run a new one to the gauge to get mine to work when I converted it. I was using A Shiftworks conversion kit, but this was in the instructions when I finally got around to reading them after trying to troubleshoot it...

TEMPERATURE GAUGE

1. The Temperature Gauge needs power. A Jumper wire is provided
to get power from the Fuel Gauge.

2. It also needs a signal from the new sending unit. This wire must be
run directly from the sender to the gauge. The idiot light wire ran
through the ignition switch, and this will not work with the new
gauge.
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post #27 of 54 (permalink) Old Aug 23rd, 18, 8:07 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

I have all brand new wiring from M&H for a Gauge Dash wiring harness and all new forward wring and engine wiring to match every thing as far as wiring is new from M&H.
I may not be getting the proper Ohms reading I am hoping as I am not that knowledgeable of how to properly check with a meter.
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post #28 of 54 (permalink) Old Aug 23rd, 18, 8:12 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Coppertop View Post
If the connections are good, you will see voltage on the green under hood wire with it disconnected from the sender (of course the key has to be on).

This is because a voltage divider is formed between the sending unit and the gauge assembly. So with an open ( green wire disconnected from the engine sending unit, your red probe of your voltmeter touching the green wire connection only and the black wire of your voltmeter to a GOOD ground), you will see some voltage with the key on.

In an earlier post you claimed you had continuity from the very end of the green wire at the engine side all the way back to the green connector at the dash/gauge end. If this is true, and the gauge has both power and ground, then signs point to a bad gauge.
= Clintsblue66 yes I did have continuity all the way on the green wire disconnected from the sensor and the gauge. I also have power to the pink wire with key in run position.[/Quote]
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post #29 of 54 (permalink) Old Aug 23rd, 18, 8:26 AM Thread Starter
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Re: 1966 Chevelle Temp Gauge not working ?

I just checked this morning I have Voltage at the green wire with the key on ? Is that telling me that the GAUGE IS GOOD ?
I also checked the gauge it did not move with the green connected to red on meter and black wire going thru my meter to ground.
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post #30 of 54 (permalink) Old Aug 23rd, 18, 8:31 AM Thread Starter
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Angry Re: 1966 Chevelle Temp Gauge not working ?

Quote:
Originally Posted by Clintsblue66 View Post
= Clintsblue66 yes I did have continuity all the way on the green wire disconnected from the sensor and the gauge. I also have power to the pink wire with key in run position.
[/QUOTE]=Clintsblue66 I do have power checking as you suggested at the green wire red from meter on green black to ground key in run position. Could it be leading back to the sensor ? totally confused..! [/Quote]
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