Gauge problems

N

nightglide

New member
Pulled my gauges out to put white faces on them. Put them back in and now the oil pressure and fuel gauge go to the max? Even with key off. I've had the gauges out a couple times to clean and what not, not sure what went wrong.
Help?
 
You likely accidentally fried your constant voltage regulator. It's best to pull the gauges out with the battery disconnected. A short to ground would fry it pretty quickly.

I fried mine by cramping the fuel sender wire when I put the tank back on. Popped open the cvr can to check out the cvr (it's that little metal box on the back of the oil and temp gauges) and it was toast after only maybe 2 seconds of being turned on. Single strand of copper wire which heats a small bimetal contact. The varnish on the wire burns off pretty quickly and causes a short within the cvr.

You can replace it with stock or build your own for cheap from radio shack parts. There is a post here somewhere I believe.
 
The gauges will still work with a fried cvr? Now my oil pressure gauge is at zero but fuel gauge is still up there
 
I believe they will register at full scale until they fry from the over-voltage they are seeing. After that they would probably fall back down to 0 and wait to be replaced.
 
register at full scale until they fry from the over-voltage they are seeing
Click to expand...
That only takes about 3-5 seconds at 12v

you can test each gauge with 3 vdc. Tape a couple of d cell batteries end to end (+- +-) for 3 volts. Tag the gauge terminals with your 3 volt supply. The gauge will safely register full scale if it is ok.
 
Ok, cool. I'll test em
the oil pressure gauge has gone done to 0 and dosnt move now. The gas gauge is pegged but does seem to go down as I use gas.
Thanks
owen
 
Ok first time writing in this forum so not sure if this is where you post things, though it is in a fuel gauge thread. Anyway, I have recently restored my 74 Scout 2, rewired, lots of money out the door, the whole 9. My biggest issue is the fuel gauge. I struggled with it a bit and finally got it working by changing out a few different cvr. The issue is where the needle falls on full/empty. I just replaced the sender for 19 gallon tank not sure of the specs. I just ran out of gas with the needle on half full (oem gauges). Filled it up and its waaaaay past full. Any advice would be great. Im also not the best with all this ohm measuring stuff so if any advice includes specifics just be detailed so I can follow. Thanks.
 
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