Quote:
Originally Posted by dezdud
Haha...Ya, it's haunted alright.! I will go ground hunting 1st. Thanks.
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First off you need to make a signature and tell every body what year truck you have and what engine and trans so we know what we are dealing with. I searched your posts and see that you have a 69 so that helps a bunch.
It's really hard to tell what is wrong when someone has been rewiring stuff so it is easier to show how the wiring should go.
The first problem you have is that the fuel gauge is not getting a ground from the sending unit and as the others have said, it is hunting for ground through the dash circuit, mainly the high beam indicator light and the turn signal light. When it doesn't get a ground it will go way past full like it's doing.
Do you have the battery gauge dash or the idiot light style?
Look on the fuse panel on the right edge and you should see a brown or tan wire going to a terminal labeled fuel. This is the ground wire from the sender in the tank. If it's there then run a jumper to the nearest good ground and watch the gauge with the key on. It should go to empty. If it doesn't then run the jumper to the fuel gauge or to pin 4 on the cluster plug. There should be a pink wire on the no 3 pin of the cluster plug for a battery gauge dash and if it's an idiot light gauge the pink wire will go to the no 7 pin. This is the power wire for the cluster and since you are getting past full on the gauge I'd say it's on the right pin.
Here is the gauge cluster plug connections.
Here is the wiring for the cab and the dash cluster for the idiot lights in the right center of the diagram.
Here is the fuse panel and you can see the sender connection from the fuel tank. This one is on the left end. some are on the right end.
