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Old 06-17-2008, 11:15 PM
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Fuel gauge woes

I put a new 12 volt fuel gauge and tank sender in my '54 Ford(converted to 12 Volt) I have a good ground,when the ignition switch is on my test light shows power from the switch but none going to the sender so no reading at the gauge.Does that mean the gauge is bad? Since I had the gauge for over a year I can't return it,is there a way to determine what ohm the sender is to match up another gauge,also the tank is half full.Thanks!

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Old 06-18-2008, 12:00 AM
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The sender should get a "pulsed" signal voltage of around 6 volts. On the back of your dash is a voltage limiter, that will send the correct pulsed signal to the sender. This can be found online easily. Look for one out of a early 60's application, and it will work.
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Old 06-18-2008, 05:57 AM
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If I read it correctly, you have power to the + side of the dash gauge?

If so, you can test the dash gauge by grounding the sender wire which should 'peg" the gauge.

Some gauges do, & some don't, have a "pulsed" voltage limiter, and I have no idea if your 54 with an "upgraded" system would have one or not.
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Old 06-18-2008, 06:56 PM
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Quote:
Originally Posted by carsavvycook
The sender should get a "pulsed" signal voltage of around 6 volts. On the back of your dash is a voltage limiter, that will send the correct pulsed signal to the sender. This can be found online easily. Look for one out of a early 60's application, and it will work.
No,the original gauge is history, the gauge and sender are new aftermarket 12 volt.
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Old 06-18-2008, 07:06 PM
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Quote:
Originally Posted by JeffB
No,the original gauge is history, the gauge and sender are new aftermarket 12 volt.
Are you still using the original wires on the back of the dash for the new gauge? Or did you bypass all of them?
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Old 06-18-2008, 11:40 PM
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Quote:
Originally Posted by carsavvycook
Are you still using the original wires on the back of the dash for the new gauge? Or did you bypass all of them?
The old wires were totaly shot,the cloth was rotted off,half of it was missing.I rewired the entire car circuit by circuit,the only original gauge is the speedometer,none of the original wiring remains.Engine is a 302 from a '84 Lincoln MK VII and AOD with HEI dizzy,one wire alt,wipers,fuel pump,fan are all electric,nothing like the old stocker.
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Old 06-18-2008, 11:59 PM
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Quote:
Originally Posted by JeffB
The old wires were totaly shot,the cloth was rotted off,half of it was missing.I rewired the entire car circuit by circuit,the only original gauge is the speedometer,none of the original wiring remains.Engine is a 302 from a '84 Lincoln MK VII and AOD with HEI dizzy,one wire alt,wipers,fuel pump,fan are all electric,nothing like the old stocker.
Thanks for that info. You can ohm the sender to see if it has any resistance in it at all. This will tell you if the sender is the problem, or not. Also make sure it has a good clean ground.

Be careful on this test of the gauge. Make sure you have voltage to the positive side of the gauge, and ground the sender side of the gauge, to see if the gauge moves to past full. If not the gauge is bad.
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Old 06-19-2008, 02:03 AM
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