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Signature 300 fuel gauge

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OK...Again more help requested. Today was the first time I had the boat out and started learning how to dock the boat with a great tutor, after some lessons we headed over to the fuel dock and filled the tank ($523.00 eek)

Fuel gauge worked fine before but after filling the tank it was reading under the "E", is this a possible issue with the float that might start working again when the level drops a bit or is there other issues?


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I took this from another forum, beat typing all this , hope it helps.

Boat Fuel Gauges are pretty simple instruments.

A couple things to know ahead of time:

1) You'll need access to the back of the fuel gauge

2) You'll need access to the fuel sender. It's either accessed through a small circle cover on the floor, likely in the middle of the floor, midway to rear of the boat or you'll need to remove the center panel of flooring, which will have screws to do this.

3. Here's a wiring diagram:


4. On the back of your fuel gauge there should be wires going to 4 different locations. One will be a black wire, that'll be ground. One will be purple, or at a minimum connect to the "I" terminal, that's the switched power from the ignition. One wire will be blue, or go to a post very near the backlight light bulb. The last wire will be pink (this should always be pink).

Here's how I'd trouble shoot:

1) Turn the key switch on, so the gauge has power.

2) Disconnect the pink wire from the back of the gauge. What does the gauge read now? If it goes from full to empty, and your fuel tank's not full, the pink sender wire is grounded out somewhere between the dash and the fuel tank sender - it may have rubbed though on a sharp edge somewhere - you'll need to try and follow the wire back to the sender.

3) Take a jumper wire (short piece of wire w/stripped ends) and jump between the pink terminal and the ground terminal (black wire). Did you gauge go to full? If so, that verifies that your gauge is working properly. If it didn't you either don't have a good ground connection to the back of the gauge (use a testlight or multimeter to verify) or your gauge needs to be replaced.

4) Get access to the sender. You should see a pink wire (the same one that's connected to the back of your gauge) connected to the center portion of the sender, and a black wire (ground) connected to the outside / screw holding the sensor in the tank.

If troubleshooting on the gauge side of things didn't answer your questions, do this:

5) With the key switch still on, disconnect the sender wire. Did you gauge drop down to empty? If so, things are working properly. If it didn't do anything, as mentioned in 2, the pink wire is shorted to ground and you'll need to trace or replace the pink wire. You can also perform a continuity check on the pink wire between the sender and gauge location.

6) Disconnect the ground wire from the sender and touch it to the pink wire on the sender. Did your fuel gauge go to full? If so, things are functioning properly. If not, the ground to the sender is bad (check with a test light or multimeter), or your pink wire has a complete break in it somewhere.

A couple shortcuts / thoughts here:

1) If you gauge reads full all the time, the pink wire is contacting ground somewhere, or your sender is so sticky it's not allowing the float to drop down when the fuel level goes down. Check the wiring side first.

2) If you gauge read empty all the time there's a break in the pink wire somewhere or the sender's stuck in the down position.

If everything checks out above, it's likely your sender.

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