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Old 02-19-2015, 05:10 PM   #1
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Default Garmin GFS 10 Fuel Sensor Wiring Question

I'm planning on installing a couple GFS 10 sensors on my World Cat and I have a question about the wiring to the fuel tank level sensor. The instructions call for the brown wire to be connected to the Fuel Level Sensor and for the grey wire to be connected to the ignition wire. As the ignition switch is a long way from where the GFS 10's will be installed, I'm wondering if there's any reason I can't connect the grey wire to the 12V that will be powering the GFS 10.
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Old 02-19-2015, 06:00 PM   #2
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It will then always remain "ON" unless you turn off the power to it via a switch.

If you don't turn it off when not in use, it will probably wear out sooner and could slowly drain your battery.
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Old 02-19-2015, 06:20 PM   #3
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run the wire to your gauge cluster. then tank level and ign are side by side on the gauge. it comes with long wire for this.
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Old 02-19-2015, 06:28 PM   #4
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Originally Posted by ejthomp View Post
It will then always remain "ON" unless you turn off the power to it via a switch.

If you don't turn it off when not in use, it will probably wear out sooner and could slowly drain your battery.
I'm going to power the GFS 10 off one of the Aux switches, so the power to to the GFS 10, and thus the power to the grey wire, would be turned off when the the boat is not in use.
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Old 02-19-2015, 06:28 PM   #5
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I have an extra NIB GFS10 that I picked up from Garmin on warranty to replace what I thought was a defective unit on my boat. When I went to replace the "defective" unit, the problem was gone and I never got around to returning it for refund. I'm guessing Garmin has a time limit on the return, let me know if you're interested via PM and I'll make you a deal, send pics, the correspondence with Garmin, yada yada yada.
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Old 02-20-2015, 05:39 PM   #6
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If OP doesn't want it,I may be interested in it. Let me know.Thanks!
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Old 02-23-2015, 04:20 PM   #7
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Read the last sentence in the second "Notes" bullet point on page 3 of the Garmin GFS 10 installation instructions.

It says do not connect the grey wire if you go to the top of the tank sensor. Weird.

If you don't have a gauge and only have a fuel tank with sensor the gray wire doesn't need power. I guess it still works? I'll find out....
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Old 02-23-2015, 05:03 PM   #8
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Quote:
Originally Posted by Another Distraction View Post
Read the last sentence in the second "Notes" bullet point on page 3 of the Garmin GFS 10 installation instructions.

It says do not connect the grey wire if you go to the top of the tank sensor. Weird.

If you don't have a gauge and only have a fuel tank with sensor the gray wire doesn't need power. I guess it still works? I'll find out....
I did see that. It only applies if you have no fuel gauge at the panel. I do have one and want to leave it operational.

I've sent an email to Garmin asking for clarification.
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Old 04-03-2015, 07:09 AM   #9
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Quote:
Originally Posted by BayHouse View Post
I have an extra NIB GFS10 that I picked up from Garmin on warranty to replace what I thought was a defective unit on my boat. When I went to replace the "defective" unit, the problem was gone and I never got around to returning it for refund. I'm guessing Garmin has a time limit on the return, let me know if you're interested via PM and I'll make you a deal, send pics, the correspondence with Garmin, yada yada yada.
BayHouse,

I sent you a PM.
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Old 03-20-2017, 11:49 AM   #10
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Quote:
Originally Posted by raduray View Post
I did see that. It only applies if you have no fuel gauge at the panel. I do have one and want to leave it operational.

I've sent an email to Garmin asking for clarification.
This is old thread but plan on doing same thing with my world cat 320. Is the gray wire need it for it to work? Or can you just connect the brown wire to the fuel tank? It would make install much easier.
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