Fuel Gauge Wiring Help?!!
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Cross-Country
Joined: Apr 2009
Posts: 92
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From: Fort Smith Arkansas
Fuel Gauge Wiring Help?!!
Have an 81 F150 4x4 with a 351M, C6 and dual tanks.
I have a different fuel tank selecter valve than whats shown at the parts store, but i know what i have is factory because the valve has motorcraft stamped on it and also the factory wiring hasnt be altered. I'm having troubles finding this part but this is not what the post is about.
Here is what the parts store says i need: Buy BWD Fuel Tank Selector Valve FSV2A at Advance Auto Parts
This is more like whats on my truck: BWD FSV1 - Fuel Tank Selector Valve | O'Reilly Auto Parts
I'm wanting to put an after market fuel gauge in and i need to know what wires to splice into on the factory harness to get it to work.
Thank You,
Josh
I have a different fuel tank selecter valve than whats shown at the parts store, but i know what i have is factory because the valve has motorcraft stamped on it and also the factory wiring hasnt be altered. I'm having troubles finding this part but this is not what the post is about.
Here is what the parts store says i need: Buy BWD Fuel Tank Selector Valve FSV2A at Advance Auto Parts
This is more like whats on my truck: BWD FSV1 - Fuel Tank Selector Valve | O'Reilly Auto Parts
I'm wanting to put an after market fuel gauge in and i need to know what wires to splice into on the factory harness to get it to work.
Thank You,
Josh
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
You are right, the O'Reilly part is closer to, if not the, one you need. The one shown at Advance is for the later hard plastic lines, not the rubber ones you should have on the '81.
As for the wire color, can't you look at the switch and find the wire that goes up to the gauge? Or, look at the wires coming from the tanks and you should find them at the switch, so whichever one is left should be the one to the gauge.
As for the wire color, can't you look at the switch and find the wire that goes up to the gauge? Or, look at the wires coming from the tanks and you should find them at the switch, so whichever one is left should be the one to the gauge.
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Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
There is no switched power for the gauge. It's powered with the other gauges from the cluster printed circuit board. Off the top of my head, I can't remember where that power comes from that goes to the cluster.
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Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
All gauges except the ammeter are powered by the Instrument Cluster Voltage Regulator (ICVR) on the printed circuit.
Factory gauges operate at something around 5.5 volts, this is so their readings don't vary as the vehicle's voltage changes during normal operation.
The ICVR looks to be fed from a black/light-green-hash wire from the ignition switch (which has an inline resistor in it so voltage will already be somewhat reduced at the ICVR):
Factory gauges operate at something around 5.5 volts, this is so their readings don't vary as the vehicle's voltage changes during normal operation.
The ICVR looks to be fed from a black/light-green-hash wire from the ignition switch (which has an inline resistor in it so voltage will already be somewhat reduced at the ICVR):
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