Rwsavory Posted June 11, 2013 Report Posted June 11, 2013 Our 1965 C model has a set of modular cluster gauges made by Weston Instruments. The right gauge is not registering properly, and we would like to test it before pulling the fuel sender. Is there anyone who can tell us about the pin layout in the back of the gauge, or who could lend us a known working gauge to insert in our cluster for testing purposes? Here is a picture of the gauge and the space in the cluster where it fits. Thanks.
N601RX Posted June 11, 2013 Report Posted June 11, 2013 I think the C just has 1 fuel sender instead of 2 like the F. Just unhook the wire to the sensor and replace it with a resistor between the values of 0 to 30 ohms. 15 ohms should read 1/2 full. If you have access to a decade box you can check several points quickly. 2
N201MKTurbo Posted June 11, 2013 Report Posted June 11, 2013 If you test it with a resistor, it may or may not show the problem you have. Most of these things become intermittent because of vibration. After you put the test resistor in place of the sender, tap on the metal box that holds the gauges to see if the reading stays steady. If it does then you need a new sender, if it doesn't then you need to fix the gauge. If it is intermittent, first re-seat it a bunch of times to clean the connections. If that doesn't fix it then remove the metal can from the gauge. There are two sliders on a wire-wound resistor (Wheatstone bridge), being careful not to move them lift them up and work a dollar bill between the slider and the wires and carefully work it back and forth. This will clean the connection. Put it back together and try it again. If it is still intermittent you will have to send it out for repair. I met a man at last years FAA maintenance symposium who fixes them. If you cannot find a shop to do it let me know and I will look up his name. 1
yvesg Posted June 12, 2013 Report Posted June 12, 2013 and work a dollar bill between the slider and the wires and carefully work it back and forth. This will clean the connection. Put it back together and try it again. If it is still intermittent you will have to send it out for repair. Shh..t I will not be able to do this procedure here! Dollar bills have been replaced by coins. And this year, larger cuts are made of some form of plastic... Yves
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