Items you will need Connect a 14-gauge wire (red) from the ignition switch to the I terminal on the back of the fuel gauge, then spray the connection with vinyl electrical insulator spray. Connect the wire from the sending unit to the S terminal on the back of the fuel gauge.

How do you wire up a fuel gauge?

How to Wire Auto Meter Fuel GaugesSelect an appropriate mounting location for your new gauge. Connect the end of the - wire to a bare-metal surface on the vehicle. Find a power-carrying wire onto which to mount the + wire. Connect the S wire to the fuel-sender signal wire you removed from the stock fuel gauge.

Where is the fuel sender on a boat?

You will often get to it through a deck plate at the aft end of the tank. Your fuel sender will have either two or three connections. For the three connection type, one wire runs to the gauge, another wire connects to the power supply, and the last wire connects to the ground or the negative side of your battery.

How does a fuel gauge work on a boat?

0:4210:15How To Troubleshoot & Fix A Boat Fuel Gauge & Fuel Sender YouTubeStart of suggested clipEnd of suggested clipThese fuel gauges are pretty simple you only have three wires that come into the gauge. They are theMoreThese fuel gauges are pretty simple you only have three wires that come into the gauge. They are the power or 12 volts wire. Which you want to bring in from the Keyon power wire from the key switch.

How do you replace a fuel gauge on a boat?

0:003:03How To Test and Replace Your Fuel Sender on Your Boat - YouTubeYouTubeStart of suggested clipEnd of suggested clipHook up the wires to your new gauge. Hook up your battery. So you have power so your gauge.MoreHook up the wires to your new gauge. Hook up your battery. So you have power so your gauge.

How do I know if my boat fuel gauge is bad?

If your tests show the ground is good and 12 volts at the gauge, take a jumper wire with alligator clips and connect the sender terminal to the ground terminal. If the gauge reads full, its good. If not, its bad. Replace the gauge.

How do I know if my fuel sending unit is bad?

Here are some signs that the fuel sending unit is bad and some speculations on how and why the fuel sending unit failed.Fuel gauge reading empty when the tank is full. Fuel gauge is stuck on full. Fuel gauge fluctuates between empty and full.

How do you test a gas gauge?

Turn on the engines ignition and probe with a multimeter between the ground and the positive terminal on the back of the gauge; it should be marked with a “+” or an “I.” If there is no voltage then the fault is in the ignition circuit—and the gauge is probably good.

What happens when fuel sending unit goes bad?

A faulty fuel gauge sender may cause the gauge to suddenly change positions, or give an inaccurate reading. The gauge may appear to be at three quarters, and then only a few minutes later will change to half full, or vice versa the gauge may appear to be full, only to have the gauge climb higher a short while later.

How do I reset my digital fuel gauge?

How to Reset a Fuel GaugeTurn the ignition switch to the On position.Press the Odo/Trip button until the odometer is put into ODO mode.Turn off the ignition.Press and hold the Odo/Trip button. Release the Odo/Trip button.More items

What causes the fuel gauge to not work?

What Causes The Fuel Gauge Not To Work? An inaccurate fuel tank reading is most commonly caused by the sending system which reads the fuel tank level and sends the reading to the gauge. Issues can also stem from a bad gauge, blown fuses, or corroded wiring. You can self-test all of these parts at home with a few tools.