J D 3020 Fuel Gauge

Wires got knocked off of fuel gauge, have 3 connections, who goes where? 1969 3020, diesel with 24 volt starting. One wire is to the frame, one goes to the tank sending unit. Third wire ????
 
One wire has to go to a power source when the switch is on. Look in that area behind the dash for a power wire, it may be "T'd" with another wire. Are the wires push-on or ring terminals? Doesn't matter, just curious. I did some work on a 1967 4020 a while back so I am just going from memory. It may be "T'd" with the wire going to the cigarette lighter.
I have found both in the service manual and in practice the ground for the sender is critical. I have already run a separate ground back from the fuel sender flange to the ground at the gauge.
Paul
 
Looking at some wiring diagrams, I see only an orange wire to the fuel sender. The wire to the frame is a ground. What color is the mystery wire? Has it been cut? Is there another end possibly going to something else?
 
(quoted from post at 20:42:08 07/21/14) Wires got knocked off of fuel gauge, have 3 connections, who goes where? 1969 3020, diesel with 24 volt starting. One wire is to the frame, one goes to the tank sending unit. Third wire ????

Richard
There were no '69 ""24 volt"" 3020's!! 3rd wire goes to ign switch.
 

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