yo Michael,
Where is the Needle when Bronco is running? At Empty? OR doe it mov3e from an Empty to Below Empty position?..
etc.
Testing in 87-96; Fuel Gauge Moves from E to below E; "...Disconnect the connector at the fuel tank, ground the yellow with white tracer wire (make sure you have a good ground),turn the key on-if the gauge goes to empty, chances are, the fuel sender is the problem. If the gauge doesn't move, then recheck the grounding of the Y/W wire,if it is good then the problem is is forward of the sender (wiring/connectors/instrument cluster)..."
by 85bigbronco
Wiring Diagram in an 89
Source: by SeattleFSB (Seattle FSB) at SuperMotors.net
EZ cks first; check Ground G801
Fuel Level Sender & Gauge Wiring for '92-96 Broncos ('87-96 F-series & Bronco similar)
IF THE IMAGE IS TOO SMALL, click it.
Sender Range: 160 (full) - 16 (empty) Ohms
A gauge that pegs past full indicates an open circuit (broken wire; unplugged connector; corroded terminal; burned sender) on the Y/W wire.
A gauge that pegs past empty indicates a short to ground (pinched to the frame, body, or dash supports) on the Y/W wire, OR a sunk float.
A gauge anywhere in between that doesn't move indicates an open circuit (blown fuse; corroded terminal) on the power (battery) side of the gauge OR a bad instrument cluster ground at C251 pin 9.
The terminals of C251 (& C250) are known to corrode & lose contact (open). Polish both the connector pins AND the film circuit pads with brown paper or a pink eraser.
The larger version of C441(WPT454) was used until '93.
The level sender can usually be disassembled & repaired by bending the wiper arm inside the plastic housing to apply slightly more force. See the other photos in this album.
For more info, see this album's captions:
http://www.supermotors.net/registry/2742/34307-4
by Steve83 (Steve, That dirty old truck) at
http://www.supermotors.net/registry/media/744437