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How do you wire a fuel gauge on a 6 volt 1938 dodge deluxe?

When I connect everthing, it shows O, with key off, but with when the key is on it shows full, and there is no gas in it.

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Check the fuel sending unit with a volt ohm meter for changes in resistance as you actuate the sending unit. If there are not resistance changes, then there is a problem (possibly a short) in the sending unit.

Here is a link to help with testing and hook up:

Posted on Apr 02, 2015


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Many parts stores have loan-a-tool pressure gauges. What are you working on? Older cars have two wires to the ignition coil. On is a start only wire which is active only in the start position of ignition switch and bypasses the resistance circiut to supply 12 volts to the coil when starting. This is done to cause a higher voltage, lower amperage spark to assist in starting the engine. When you release the key, juice to the coil goes through a resistance wire (chevy) or ballast resister (mopar) to send about 6 volts to the coil to give a lower voltage, higher amp spark for more efficient fuel burn. That said, more modern cars don't use these 2 circuits.

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If so remove rheostat and move float on the outside with the connection of ground and lead externally to confirm as you will notice the change on the meter.

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Gas gauge on park ave 1999 does not give accurate reading. Jumps around. Can it be done without dropping tank.

Buick dealers have a diagnostic box that checks gauge sweep and range, an 0-100 Ohm variable potentiometer with key on can check this gauge however you must tap into the wire going for the sending unit at the tank. With a voltage meter check the four wire connection (only one)connector going to the top of the tank, find a good ground and check for voltage one will be 12 volts with KEY ON ENGINE OFF look for a 12 volt reading for 5 seconds and then it will stop this is for priming fuel rail and is to fuel pump, you want the ground side of the gauge the other two will be grounds, fuel pump and gauge. The grounds may be near the wiring harness going to the frame. In either case they will be grounds you are looking for the one that is not either ground or power, most likely it will be either a flashing light or very low voltage. Attach the pot to the gauge wire and have someone watch the fuel gauge if it is erratic the gauge is the problem. If the gauge sweeps slow and steady the problem is in the sending until in the tank. AND HAS TO BE DROPPED! Run the tank down on fuel as low as you dare and drop tank. Be carefull working with fuel can be very DANGEROUS if you are not experienced working around fuel DON'T Attempt!

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