Pull gauge and sending unit OUT! Set them up with test wires, including a test ground wire directly to battery terminal, and make them read properly before you do anything else!!!! Maybe you have a 1/4 tank of gas? Anyway work the sender up and down during test to see the gauge work. Don't use ANY of the truck wiring for this. If it all works fine, then you know its Ground or supply. Check ground: Battery to engine, engine to body, body to chassis, chassis to sender ground. Then Check supply circuit all the way to gauge and to sender. (including ignition switch malfunction)
If test does not work, it's the "new" sender or "rebuilt" gauge.
I assume you have checked to see that there is hot to gauge and hot to sender, already, with a test light. and I assume it goes to empty when ignition shut off.
Last edited by bartamos; 09/30/2011 12:21 AM.
