Posted by jddave on September 28, 2012 at 17:33:19 from (67.84.199.187):
In Reply to: JD 3020 Diesel posted by Clint Barnhart on September 28, 2012 at 16:54:37:
You say your gauge is new. Is it a John Deere part or another replacement item? Some John Deere gauges replace the original and do not appear original nor do they wire the same requiring a work-around to ground a terminal plus hot wire and sender wire. Make sure the polarity is correct also. You can check the gauge by grounding the sender terminal. With and without ground and the gauge should read alternately "full" and "empty". Then check the resistance of the sending unit from "full' to "empty" with a multimeter set to OHMS. There should be a range of roughly 20-60 ohms I think. Any questions ask Jerry at Evergreen Restorations advertised in Two-Cylinder. Of course another issue is a short in the sender wiring which would ground the signal but this is not common. The sender housing must be grounded to the tank and tractor. Check for complete ground with a multimeter. I always bench test the fuel gauge with the sender before installing them.
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