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Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 05-08-2011   #1 (permalink)
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Question No gauge on my dashboard is working... HELP PLEASE

none of my gauges on my dash are working?? Any idea what i should do? the previous owner told me he put power directly to the fuel gauge and found when he did it jumped to Full.. i would assume that means the gauge works.. which mean the problem is??? any help will be much appreciated.. thank you!
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Unread 05-09-2011   #2 (permalink)
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could be the gauge voltage regulator. the gauges work on a smaller voltage than 12 volts...i believe its 5 volts but dont hole me to that. its a small metal box with 2 studs on it on the back of your cluster. not sure how to check it
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Unread 05-09-2011   #3 (permalink)
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I agree..sounds like the voltage regulator (CVR). new solid state adjustable ones are available on ebay.

Ford Mustang Instrument Cluster Voltage Regulator 5v | eBay

could also be a bad ground. is your instrument cluster screwed in to the dash?
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Unread 05-09-2011   #4 (permalink)
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Quote:
Originally Posted by mikeyt65 View Post
could be the gauge voltage regulator. the gauges work on a smaller voltage than 12 volts...i believe its 5 volts but dont hole me to that. its a small metal box with 2 studs on it on the back of your cluster. not sure how to check it
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Originally Posted by cuddyk View Post
I agree..sounds like the voltage regulator (CVR). new solid state adjustable ones are available on ebay.

Ford Mustang Instrument Cluster Voltage Regulator 5v | eBay

could also be a bad ground. is your instrument cluster screwed in to the dash?
i appreciate it. i will have to check tomorrow for both the gauge regulator and the ground.

also if this helps the lights behind the gauges work and regulate as they are supposed to
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Unread 05-10-2011   #5 (permalink)
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jagsfan811 - The gauges are powered from a constant voltage regulator (CVR) which steps the 12 volts down to 5 volts for the gauges. Putting 12 volts on the gauges can burn them out. Do not purchase the reproduction CVRs that are sold by most Mustang parts suppliers. They are made in China and only work for a very short time and then fail. I bought one and it worked for 20 minutes. As someone stated above, there are solid state CVRs on Ebay for $25.00. I have one in my 66 Coupe. They work great.

The instrument lights have no connection to the gauges. The instrument lights work on 12 volts and are adjusted by the dimmer on the light switch.
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Unread 05-10-2011   #6 (permalink)
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jagsfan811 - Here is a link to the CVR I purchased on Ebay. It works great.

Ford Mustang Instrument Cluster Voltage Regulator 5v | eBay

Hope this info helps.
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Unread 05-10-2011   #7 (permalink)
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Quote:
Originally Posted by Tbirdtony View Post
jagsfan811 - The gauges are powered from a constant voltage regulator (CVR) which steps the 12 volts down to 5 volts for the gauges. Putting 12 volts on the gauges can burn them out. Do not purchase the reproduction CVRs that are sold by most Mustang parts suppliers. They are made in China and only work for a very short time and then fail. I bought one and it worked for 20 minutes. As someone stated above, there are solid state CVRs on Ebay for $25.00. I have one in my 66 Coupe. They work great.

The instrument lights have no connection to the gauges. The instrument lights work on 12 volts and are adjusted by the dimmer on the light switch.
Thank you for the clarifying. would i need to take off the dashboard to access the cvr? is that usually what wrong when none of the gauges work? including the fuel and speedometer etc. for some reason i thought the oil temp worked but it could just be sitting in the middle

Also not sure if this is connected but the brake light is always on even though i know its not engaged.
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Unread 05-10-2011   #8 (permalink)
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Jagsfan811 - You will need to remove the instrument cluster. The CVR is mounted on the back side of the gauges. The CVR has nothing to do with the speedometer. The speedometer is a mechanical indicator. It is run by a cable that attaches to the tailshaft of your transmission. The CVR also has nothing to do with your ammeter if your car has an ammeter. The CVR only powers the fuel gauge, temp gauge, and oil pressure gauge. The brake light has nothing to do with the gauges but it sounds like you have many electrical problems. You need to invest in a schematic diagram for your year Mustang. If you can't troubleshoot electrical systems then you need to find a person who can. You will need a VOM (volt ohm meter) and know how to use it.
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Unread 05-10-2011   #9 (permalink)
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Quote:
Originally Posted by Tbirdtony View Post
Jagsfan811 - You will need to remove the instrument cluster. The CVR is mounted on the back side of the gauges. The CVR has nothing to do with the speedometer. The speedometer is a mechanical indicator. It is run by a cable that attaches to the tailshaft of your transmission. The CVR also has nothing to do with your ammeter if your car has an ammeter. The CVR only powers the fuel gauge, temp gauge, and oil pressure gauge. The brake light has nothing to do with the gauges but it sounds like you have many electrical problems. You need to invest in a schematic diagram for your year Mustang. If you can't troubleshoot electrical systems then you need to find a person who can. You will need a VOM (volt ohm meter) and know how to use it.
Thank you, yeah that what it seems like i have to do (invest in a wiring diagram) in school i have learned how to use a VOM (actually finishing that the circuits class up now) thanks for the clarifications and all your help!
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Unread 05-10-2011   #10 (permalink)
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Check the motor for the gauge wires unplug the dash gauge and do a continuity check it will make a beep when you have a good wire. If you have good wires then the regulator will have no problem working right.
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Unread 05-11-2011   #11 (permalink)
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Quote:
Originally Posted by Osprey Mech View Post
Check the motor for the gauge wires unplug the dash gauge and do a continuity check it will make a beep when you have a good wire. If you have good wires then the regulator will have no problem working right.
how many ohms should i be reading? or am i only looking for a beap?
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Unread 05-11-2011   #12 (permalink)
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Jagsfan811 - OspreyMech's comments are confusing. His sentence doesn't make sense. Just get a wiring diagram for your model Mustang and check out the wires with a VOM.
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Unread 05-11-2011   #13 (permalink)
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Quote:
Originally Posted by Tbirdtony View Post
Jagsfan811 - OspreyMech's comments are confusing. His sentence doesn't make sense. Just get a wiring diagram for your model Mustang and check out the wires with a VOM.
will do thank you!
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Unread 05-11-2011   #14 (permalink)
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does anyone have any suggestions on how to take off the speedometer cable? i got the dash off and i cant get the gauge cluster off because of that speedometer cable
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