General Category > General Discussion
Fuel level sensor plug vs. electric petcock plug
pehayes:
Ah, yes. Brilliant engineering design out of Italy. This ranks right up there with the early Norge fairing covering the dipstick.
Two identical plugs, side by side. One set with a color band located some distance away from the plug itself.
They could have used two different plugs.
They could have inverted one pair so it would be impossible to cross-connect.
They could have put both wires into one 'triple' plug.
Bella Figura. More concerned about form vs. function.
Patrick Hayes
Fremont CA
nwguy:
It'll be a while before I get the battery back in and be able to run it, but I'll plan to measure the voltage once I reach that stage. I'm going to reveal my ignorance here, but to measure as you say Ron, you put the leads from the multimeter in the 2 slots in the plug coming from harness? Does polarity matter (which slot the leads are in)?
RE: expensive fuel sensor, yeah I looked them up. Hard to find and wildly expensive when you do.
pehayes:
--- Quote from: nwguy on May 15, 2025, 02:57:48 PM ---but I'll plan to measure the voltage once I reach that stage.
--- End quote ---
Have you checked for the red color heat shrink bands? You should find two: one on the tank wires and the other on the frame harness wires. They should be within an inch or two of the plugs. Clearly shows in the picture you posted with two wires in your hand.
If you wish to measure, then both are DC circuits and polarity will not matter. Your meter will display "+" volts or "-" volts depending. You don't care about the +/- just the absolute numbers you measure. The electric petcock should display around 12 volts. The fuel level wire should display around 5 volts. If you are using an old school needle instrument, the needle might deflect the wrong way. Just reverse your probes. If you have a more-modern digital display then ignore the +/- and just view the number.
Patrick Hayes
Fremont CA
nwguy:
I have a new multimeter being delivered by Saturday. I think I can figure thins out from what you've described. Thank you.
Wayne Orwig:
--- Quote from: n3303j on May 15, 2025, 11:33:46 AM ---If in doubt put the voltmeter on the harness side plug and turn on the key. 12V is the petcock. Less is the logic circuit for fuel sensing.
--- End quote ---
This will not work.
12 volts goes to the solenoid.
12 volts also goes to the dashboard lamp then to the sensor. It will also measure 12 volts at the plug. If you are desperate, pull the bulb out of the dashboard and get zero volts at the correct sensor plug.
Look on the wire 'accordion' cover. Far away from the plug will be red paint or no red paint. If the sensor has the red paint on the cable cover, then match it to the red paint one in the harness. If the sensor does NOT have red paint, match it to the plug with no paint.
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