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Good read here: https://www.therangerstation.com/forums/index.php?threads/getting-the-fuel-gauge-to-work.140669/
But first.........................
Key OFF and battery cable disconnected any time you are working on electrics
When you have the cluster out you should test the Yellow/White wire on one of the wiring harness plugins, it comes from the sender in the gas tank
It will be the only Yellow/white striped wire
You need a OHM Meter
set for 200 ohms, if it has a selection
Touch the two probe tips together and you should see 0 ohms in the display, Ohm meter is working if so
Put one probe on the yellow/white wire and one probe on a Ground
Ohms don't have polarity and don't need electricity, meter has battery in it used for OHMs testing
Up thru 1988 Ford used senders that show 73ohm EMPTY, and 10 ohms FULL
So if you have a pre-1989 Ranger then you should see Ohms in that range on that wire
And you can rock the truck, to get gas in the tank sloshing around, and you should see the Ohms change, that means sender is working, float is going up and down in the tank
1989 and up use 16 ohms EMPTY and 160 ohms FULL, so opposite and wider range, same tests though
If yellow/white wire shows 0 ohms or under 8 ohms that means its shorted to ground somewhere or sender is
If wire shows no change(no connection) when tested, then wire is disconnected somewhere or sender is
If yellow/white wire tests as OK...........then you can replace or by-pass slosh module
But first.........................
Key OFF and battery cable disconnected any time you are working on electrics
When you have the cluster out you should test the Yellow/White wire on one of the wiring harness plugins, it comes from the sender in the gas tank
It will be the only Yellow/white striped wire
You need a OHM Meter
set for 200 ohms, if it has a selection
Touch the two probe tips together and you should see 0 ohms in the display, Ohm meter is working if so
Put one probe on the yellow/white wire and one probe on a Ground
Ohms don't have polarity and don't need electricity, meter has battery in it used for OHMs testing
Up thru 1988 Ford used senders that show 73ohm EMPTY, and 10 ohms FULL
So if you have a pre-1989 Ranger then you should see Ohms in that range on that wire
And you can rock the truck, to get gas in the tank sloshing around, and you should see the Ohms change, that means sender is working, float is going up and down in the tank
1989 and up use 16 ohms EMPTY and 160 ohms FULL, so opposite and wider range, same tests though
If yellow/white wire shows 0 ohms or under 8 ohms that means its shorted to ground somewhere or sender is
If wire shows no change(no connection) when tested, then wire is disconnected somewhere or sender is
If yellow/white wire tests as OK...........then you can replace or by-pass slosh module