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Unread 08-11-2014, 08:13 AM   #1
YJames90
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1990 YJ Wrangler 
 
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What is the voltage going to the fuel gauge float?

I have a fuel cell in the back of the Jeep that didnt come with a gas guage float.
I took apart the YJ sending unit and removed the float unit and will be installing it in the cell.
What is the correct voltage in the wire going to the float?

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Unread 08-11-2014, 08:53 AM   #2
Mike Romain
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It is a variable resistor to ground. The gauge reads the resistance to give the reading.
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Unread 08-11-2014, 09:20 AM   #3
tom_sprecher
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Not quite. The gauge measures the current flowing through the variable resistor to ground. The voltage at the variable resistor changes with current. Google how a fuel gauge works for several diagrams, explanations and even videos.
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Unread 08-11-2014, 09:39 AM   #4
YJames90
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Its a hot wire. I was getting 8 volts not hooked up to anything and it does work correctly when wired up
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Unread 08-12-2014, 08:32 AM   #5
Que89YJ
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You have 12 volts on the cluster. It goes through the gauge to a wire that connects it to the variable resistor the float operates to ground. 8 volts is about right with the voltage drop on the gauge and wire.
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Unread 08-12-2014, 10:31 AM   #6
bpounds
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7.5 volts per the FSM.

Sender values are:
Empty = 0 ohms
1/2 tank = 44 ohms
Full = 88 ohms
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