| oldguy | -- 08-10-2013 @ 7:28 AM |
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Hey Guys, Does anyone have/know what the OHMS reading would be for "FULL" and "EMPTY" for an original dash gauge? Thxs Oldguy
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| supereal | -- 08-10-2013 @ 11:14 AM |
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None of my service manuals give a resistance reading for the gauge. If the gauge doesn't swing the entire scale when the wire to the sender is grounded, the gauge is defective, and must be replaced because the heater winding is open. The main cause for gauge failure is excessive voltage. Six volt gauges must be operated with only that power. The sender also has a heating unit which causes a set of points to chatter as they provide a ground to the gauge. Fuel level is registered by a cam connected to the float arm that changes the point gap as fuel level changes, so no resistance reading can be taken. Replacements for the original King-Seely senders use a variable resistor run by the float arm and can be tested for resistance. This message was edited by supereal on 8-10-13 @ 11:19 AM
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| TomO | -- 08-11-2013 @ 7:12 AM |
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The ohm reading would be the same for full or empty, about .2 ohms. The gauge and sending unit are not resistive units, they are of a balanced current type. There is a bi-metal strip in each of them with a heater coil. The tank unit has a set of contacts that the closing gap is changed by the fuel level in the tank. If your gas gauge goes towards empty when the ignition switch is on, the dash unit is probably good. You can see if it will read full by temporarily grounding the wire to the tank unit and the gauge should move towards full. Tom
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