Stumped

moparlover said
just at the stud

the base of the sending unit is grounded and the stud is insulated and with it plugged in it could be from 0 to 5v depending on how high the float is.

unplug the sending unit wire. measure the resistance-ohms between the tip of the stud and the base of the sending unit. it should be around 10ohms if the tank is full and about 100ohms if the tank is empty. or somewhere in between
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Right. Been there , done that. Not having problems finding ohms. I'm getting 5v no matter where i touch it on the sending unit. I'm thinking I have a short in the unit itself. I will still get all the correct ohm readings but the voltage isn't making the resistance it needs to operate. In other words ,it works by hand but not by voltage.