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I need to wire my fuel gauge from the tank to my dash for a after market gauge because my old one was wired wrong when I bought the Sammy and I pulled it all out an I need to wire it back and I need some advice thanks its a Suzuki samurai 1987
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Probably the sending unit inside the tank. Only seldom is it a bad gauge in the dash. You can check which it is with this test: you will need a helper. Disconnect the electrical connector at the gas tank. You will be just momentarily grounding the fuel gauge wire that goes to the sending unit in the tank. this is either a yellow or red wire in the body side of the tank connector. Use a jumper wire and with the key in ON, not start, just for only a second, ground the red (or yellow, but I think it is red) wire to ground. While it is being grounded, someone needs to watch the gauge needle on the dash. Any perceptible movement of the gas needle means that the dash gauge is good and the problem is the sending unit in the tank.
The sending unit is a variable resistor to ground. The gauge on the dash has a small current flow that goes to the sending unit. So when you ground this wire from the gauge, you should have movement of th3e gauge needle. Do not ground it for more than a second, or you could burn out the gauge unit in dash.
That won't affect the fuel gauge. Different circuits, entirely. Any issue with the fuel gauge is between the gauge on the dash, a little wiring to the gas tank, and the sender unit inside the tank. In most cases, the problem turns out to be the sending unit inside the tank.
To check the gauge itself for working, you can ground the fuel gauge wire at the gas tank connector, and watch for movement on the gauge, with the key in ON. You take the connector off at the gas tank, find the wire for the fuel level sender (or gauge), and touch it to a good ground- a metal piece on the car frame. If gauge is good, the needle will move either to full or to empty, but you can see the needle move to a new point, when you (temporarily, only temporarily) ground the fuel gauge wire. The key in the switch must be in on. If this causes the needle to move, then the dash gauge is good, and the problem is the sender unit in the tank. This unit has a variable resistor, not too expensive. The fun is getting to it.
A vehicle that old will need all the wire connections cleaned and tightened. Also may need new oil pressure sending unit, and new temp sending unit. Might need new speedometer cable and fuel gauge sending unit in the gas tank.
its 1 of 2 things.
1: the fuel is low, use a dip stick, if gauge reads ok.
2; or the tank sender is bad, but gauge reads wrong.
3: the guage wire is disconnected, cut or corroded connections.
there is two things : fuel gauge and dash fuel gauge. The fuel gauge in tank rated to 0 to 90ohms.disconnect wire at the tank take a variable resistor connect it to wire .read the dash gauge if it move as you move the resistor. if ok fuel tank gauge is at fault
Hi , there will be 3/4 wires at the fuel tank gauge. 1 ground wire ,1 gauge(on dash) wire, 1 gauge low level indicator light (warning on dash) Get a test lamp , ground test lamp and probe each wire. 1 will do nothing (earth wire) 1 will bring on dash low fuel light , the other will be the gauge on the dash which will rise (slowly) to the full position.
Likely, it's the sender unit in the tank. To check wiring and your dash gauge, you can pull apart the connector at the fuel tank, find the wire for the gauge sender unit (its color coded-I dont kinow what the one for your car would be), and on the harness side(the one going to front of vehicle) use a jumper wire and ground that wire to the car frame(get me? you want to ground the wire going to your dash gauge)-with key on, your gauge working properly will move up to half-way or even full. That tells you your dash gauge is working and your wiring to gauge is good. If gauge doesn't move when grounded(double check for a good ground), then your dash gauge may be bad.
need a wire diagram too for the switch I have discovered that two wires powers the pump to pressurize te lines and other 2 powers the fuel gauge on the dash but 2 wires i don know what they do my gauge doesn't indicate fuel in any combination of the six wires
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