Wire a fuel gauge by first disconnecting the old dysfunctional unit to replace it with a new one. Obtain 12-volt power from the fuse box using a standard wire, and connect it to the positive terminal of the fuel gauge.
Wiring a fuel gauge is much the same as wiring any other gauge on your boat: one wire comes from the ignition to the instrument, one wire comes from the sensor to the instrument, one wire comes to the instrument light and one wire from the instrument goes to the boat's common ground.
With power running to the gauge, disconnect the sending wire; it will be marked with an “S” at the back of the gauge. Once the wire is disconnected, the gauge should jump to its highest possible reading. If this is the case then the gauge is good and you can proceed to the next step.
How to Wire Auto Meter Fuel Gauges ... Connect the "S" wire to the fuel-sender signal wire you removed from the stock fuel gauge. This wire is fed directly to the post on the fuel-level sender in the fuel tank. Twist these two wires together and cover them with a layer of electrical tape.
Connect sender wire from fuel gauge to the threaded screw terminal on sender. Connect ground wire to 1/4" fasson terminal on sender. GASOLINE IS EXTREMELY FLAMMABLE. KEEP TANK AREA FREE FROM SPARKS AND FLAMES. EMPTY TANK OF FUEL AND FUMES BEFORE CONTINUING WITH INSTALLATION. Gauge and Sending Unit Wiring Diagram and Industry Recommendations.
If you DO have 12 volts to the fuel gauge, the next step is to remove the fuel sending unit wire, and, with the ignition key “on”, ground the sender wire to a good chassis ground. The fuel gauge should immediately go to empty. Removing the sending unit wire from the chassis ground the fuel gauge should go directly to “full”. If the fuel ...
Connect a yellow, 14-gauge ground wire from the negative (-) terminal on the gauge to your boat's common ground or common grounding buss. Whether the connection to the fuel gauge is a clip connection or a screw connection, spray it with vinyl electrical insulator spray after making the connection.
Wiring for the gauge chosen will vary depending on the application. Instructions for this are usually included with the gauge package. Your fuel gauge may seem like a minor item until you find yourself out on the open road in the middle of nowhere and without a fuel stop insight. Then you may learn to appreciate this often-overlooked item.
This video will help you troubleshoot your fuel gauge and sending unit, to verify if it is good or needs to be replaced. This video will help you troubleshoot your fuel gauge and sending unit, to ...