My fuel gauge was working fine until i disconnected the power at the fuse box and hooked up a fuse and power lead for a new stereo that i installed now the fuel gauge is not working right when the car is off the needle is at the bottom and when i start the car the needle goes to the right and hits the needle stop on the wrong side

If your fuel gauge is not working, there are several potential reasons for this issue:
1. Faulty Fuel Sending Unit:
-The fuel sending unit is a component in the fuel tank that measures the amount of fuel and sends signals to the gauge.
2. Faulty Gauge or Instrument Cluster:
- The gauge itself or the entire instrument cluster may be malfunctional. Electrical issues, such as a blown fuse, could also be a factor.
3. Wiring Issues:
-Broken or damages wiring between the fuel sending unit, gauge, and instrument cluster can disrupt the communication and cause the gauge to malfunction.
4. Bad Ground Connection:
-A poor ground connection can lead to inaccurate readings on the fuel gauge. Check for loose or corroded ground connections.
5. Fuse Problem:
-A blown fuse in the vehicle's fuse box could disrupt the electrical circuit that powers the fuel gauge. Consult the vehicle's manual to locate and check the fuse related to fuel system.

Could be to late. Could have blow the BCM. Unhook the radio and see if the other things start working. If they do, your lucky. Then find some to hook up the radio. I can install radios, but I use a volt /ohm meter. You can not trust the diagrams the radios come with. Or the diagrams I buy.

My first advice is to throw the out and buy something a little more dependent than that piece of s...junk. But if that option does not appeal to you for whatever reason try this.

Try replacing the fuse, sometimes the fuse may look fine but is not functioning properly. Or try replacing the relay switch for the wiper motor. If that does not work than you have a couple of different possible issues. I would suggest taking it into a shop to get it fixed because it will take time and skill to find the problem.
Take a multimeter and check the volts leading into the fuse. If you have no power leading to your fuse that the problem might be a wire the wire leading into your box.
If you have power there than you need to follow the wire leading out of the back of the box to your gauges. Check the power at each point in the sire system leading to your gauges and you will know if a stretch of wire is bad.
If one part of the wire is burnt or fired than you will need to check the volts and amps leading to your wire and find out why you are getting too much power to that area or it will continue to happen until you fix the issue.
If this does not help you than i would need to take a look at the car to help you more.

Remove the stereo wiring, recharge the battery if flat and retry.
If the problem is solved, then you have an issue with your stereo wiring.

Sound system w/o amplifier. Not only check the fuses, check the fuse circuit for voltage, use a test lite. As you can see, one fuse is hot all the time, the other fuse goes hot with the key on. Also check ground wire, that wire color is black.

Did you disconnect the stereo wires you'd hooked up and see if everything went back to normal? It's easy to connect some custom equipment to the wrong wire. Depending on the stereo you installed, there would probably be 3 wires that are battery positive at any time, and at least one ground wire. There's a wire that's "hot" all the time that provides power to keep the station memory and clock, etc., set. Then the wire that actually powers the radio when you turn it on. The other wire would be hot FROM the radio when oyu turn the radio on, and it's meant for cars that have an electric antenna so the antenna raises automatically when you turn the radio on. If you connect either one of those wires to the wrong wiring harness wire, you can have power to something at an inappropriate time. The best thing to do (without cutting the harness wires) is to use the proper power leads in the factory wiring harness. Otherwise, if you look at your truck fuse-box diagram, you should see that one fuse is marked like "constant battery". I think that will be the fuse towards the front of the truck in the very bottom row of fuses. The wire for your station memory/clock can go to that fuse. The fuse towards the BACK of the truck in that same row is "radio/ignition". THAT fuse only sends power when you turn the ignition switch on or to accessories. Use it for the radio power. If you don't have an electric antenna, don't bother with that wire. To wire straight to a fuse, you need to determine which leg of the fuse power comes in on, then strip about half an inch from the wire and wrap it around the leg of the fuse that goes in the OTHER side. That way your system is protected by the fuses. If/when all that is done, you may have blown a fuse or relay in the big box under the hood on yop of the left fender-well. Let me know if you need help still, but as this problem is 4+ months old, I imagine you fixed it already. [email protected]

Hello,

If your stereo was working fine prior to the hot lead to battery being replace and now the stereo is on, but only static. It most likely is some how they disturbed the lead that goes from the stereo to the battery. I believe it is a ground issue. The stereo has to be grounded properly to have it work proper as well as to the antenna. Now, I believe what happen is that when they disconnected the battery, it trigger off the stereo, or they disturbed the lead to antenna or ground to the stereo.

I would try a couple things. I would unhook the battery lead again, and let sit for about 5 minutes. Re hook up and see if it works proper, If not, then trace all wires from radio to power source and grounds. I hope this helps Mike.

I WOULD JUST REPLACE THE PUMP AND GET A WET DRY VACC TO **** OUT THE OLD GAS.THE PUMP COMES OUT THE TOP OF THE FILLER NECK.REMOVE THE LID OR THE COVER,, THEN THERE IS A BUNCH OF 10MIL BOLTS AND SOME GAS LINES TO DISCONNECT.ITS PROBABLY ALL RUSTY AND THE FUEL GAUGE DOESNT WORK AFTER ALL THESE YEARS.I WOULD GET A USED UNIT ON EBAY.

ok, most likely he hooked up the power to the wrong place or worse disconnected an important ground connection. the fuses will not blow because current is probably being redirected to other circuits. try to remove the radio and its connections and recheck for anything that got loose or removed especially ground connections. get a wiring diagram for your car and hook up power to the accessory circuit and make sure that it is protected by a fuse. again ground wires and connections are very important. problems here can cause a lot of weird symptoms.

do you have taillights? most of the time there on the same fuse. also chk. to see if plug is all the way in on your headlight switch.