all gauges go on and off.... - 64-73 TECH - TECH ( how to, help and such)

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MUSTANGS OF EAST TEXAS CAR CLUB > TECH ( how to, help and such) > 64-73 TECH > all gauges go on and off....

all gauges go on and off....

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Junior Knight
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Joined:	Mon Jan 15th, 2007
Location:	Eustace, Texas USA
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Posted: Tue Jun 24th, 2008 12:33 am

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my gauges on my 66 mustang go on and off ...mostly off. A ground problem I'm sure. That being said..I have changed everything..brake lite switch,lite switch,etc...still nothin. Then I was told about the ignition switch could be bad...could that be it?? :shock:

any help ?

white35th
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Joined:	Thu Oct 12th, 2006
Location:	TYLER, Texas USA
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Posted: Tue Jun 24th, 2008 01:17 am

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Is it the gauges or the gauge lights? If it is the gauges there is a part under the dash that mounts on the back of the gauge cluster called a constant voltage regulator. They go bad all the time and can cause two different probs. One is that the gauges all read very high or they quit. It will afect the fuel, temp, oil press and gas gauges. It could be the prob. If it is the lights it is not the ign switch.

Last edited on Tue Jun 24th, 2008 01:19 am by white35th

Junior Knight
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Posted: Tue Jun 24th, 2008 01:40 am

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I replaced the cvr...it is the gauges...

white35th
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Posted: Tue Jun 24th, 2008 02:44 pm

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The way those gauges work is they all have 5 volts from the CVR on each gauge then the ground side of the gauges go to indivigiual sensors that tell the gauge what to do. If they all quit at the same time it is going to be the power to them not the ground side. so it is either the power to the cvr or a bad conection between it and all the gauges. The only common ground in the system is on the case of the CVR and if you loose that the gauges will peg out high. If you can get to it and measure the power while they are not working you should be able to run it down. Keep in mind it is not unusual to get a cvr brand new that does not work. I tore mine apart and installed a solid state 5 volt regulator inside it I got so frustrated trying to get a good one.

Last edited on Tue Jun 24th, 2008 02:47 pm by white35th

Junior Knight
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Joined:	Mon Jan 15th, 2007
Location:	Eustace, Texas USA
Posts:	45
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Posted: Tue Jun 24th, 2008 05:05 pm

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OK, thanks!

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