Now you can relax, even if there is no wind, as you will now know whether you have enough fuel for your iron genny to carry you home safely. I don't know enough about the electrical specs to say for sure. Only the fuel should show empty all the time with sender wire disconnected and taped over eyelet to keep from accidental grounding. If you are not sure you have a good ground, hook up a ground straight from the battery to the tank ground and then to the sender ground. Allen: Whoops, I just realized I answered your question wrong, doh! However, I'm at work and all this is from memory.
It looked like this on two diagrams I looked at today. Fuel Gauge The left most post is the power feed. If the gauge reads full or empty with the resistor pack in place of the sender, then the gauge or anti-slosh module is at fault. I am trying to replace the portion of the wiring harness that has been cut and removed from under the back seat that went to all the electrical components in the rear of the car off topic car listed in my profile. If the wires are corroded or the insulation is worn down, replace the wiring. First of all, I hope you're having a wonderful time with your son! There may also be a ground wire coming off a second post at the edge of the flange.
It looks like i'll need to lower the tank and take a look at the sender. Luckily for some reason after trying the same thing again it worked, just putting the pin directly into the adapter without the connector. Guys, this is a simple question. Some instrument shops will rebuild them. I picked up a replacement solenoid at the junkyard last month, and there were a lot of dual tank trucks in the yard. And it would be a great thing to post the diagram somewhere for others in the future.
The first part of the circuit coming off the control switch has 4 wires running out the firewall and down to the tanks. When wiring a fuel gauge, it is wise to have a full tank in order to monitor the installation correctly. Just a hunch but I think that the two terminal fuel gauges are for 6 volt systems. What you should have depends on the year of the jeep but the two terminal fuel gauges used an external regulator the 3 terminal gauges have a regulator built into them. My original setup was a dealer-added aux tank, and it used a three port solenoid and a T in the return line. Thanks The sender being in the fuel will not make any changes to your sender resistance. I though you'd asked about the gauge.
If voltage is good, the gauge is faulty. I aquired a '77 Scottsdale, 4x4, short bed, 350, with dual tanks and at the selector valve underneath the truck it has a wire disconnected. Also I would think some relay would be clicking unless you have installed some sort of computer then who knows at this point. Previous owner installed a second tank and said the gauge works, but needs wired up, all wires are tagged. Switching to a standard setup might be easier than figuring out what you already have.
One wire goes to the center pin on the tank sending unit, one goes to ground, and the third connects to a 12-volt source, normally the ignition switch. Wiring If all of the above checks out, the issue is likely corroded wiring or a grounding issue. If so where might you find someone and how much would it cost? Set your multimeter to the Ohms scale and check the resistance within the wire. Sending units are just a resistor, so won't care about voltage, but since it's a fine wire, a 6v could overheat on 12v. All I find is for the newer gauges.
If you are diagnosing a modern vehicle, look in your owner's manual for the instrument cluster self-test procedure. It is designed to drop 12 volts to 6 volts by inserting 1. Put in the new screws and tighten them down. I passed up a chance to get a couple of them as they were not working. If the tank has a spade connector, make sure its clean and tight.
If I had a bundle of wires in my hand that I didn't know where the went I'd pull fuses to at least I'd circuits. This means you can hook them up any old way and they will work. Re: Gas tank sending unit wiring diagram help Silvertip and all of you with the good info, Thanks a heap. A spark with the fuel tank open could cause a fire or an explosion. The test for this is straightforward.