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Re: 68-69 b body sweep dash fuel gauge
[Re: 440challenger]
#450462
08/27/09 02:26 AM
08/27/09 02:26 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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If the instrument VR is working you should see voltage at the gauge. With a stock VR it may be pulsing 12 volts, or with a solid state regulator, about 5 volts constant. Either way, with the sending unit wire grounded it should read Full or above. If it does not read at least FULL the problem could be the gauge or the instrument VR output. Easiest thing would be to swap out either item with a known good one. If the Voltage regulator is good, you may be able to re-calibrate the Fuel gauge by slightly moving/rotating the small teeth behind the small holes on the back of the gauge? If the gauge responds when the sending unit wire is shorted to ground, but not when connected to the sending unit, make sure the sending unit is grounded. The factory used a small strap that cliped to the fuel line comming out of the tank jumpering to the cars chassis mounted fuel line.
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Re: 68-69 b body sweep dash fuel gauge
[Re: 451Mopar]
#450463
08/27/09 05:37 PM
08/27/09 05:37 PM
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Joined: Aug 2007
Posts: 173 East TN.
Moparsky
member
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member
Joined: Aug 2007
Posts: 173
East TN.
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It is my understanding that many vendors still sell "sending units" (designed for GM cars) for MOPARS use & the ohms output is all wrong for OEM Mopar gauges. Do a search on here, others have had this problem & found proper source. I have this problem also, at a full tank my gauge only reads a little over half full. Edit: MOPARTS member "Mopar Grandpa" reported senders from Inline Tube worked with zero problems; http://www.inlinetube.com/John
Last edited by Moparsky; 08/27/09 06:52 PM.
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