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1979 Ford Bronco/F100-F350 Fuel Gauge & Tank Selector Wiring Diagram
Reference · 1978-1979 BroncoAll 116 wiring diagrams
Gage wiring through fuse 5: fuel sender, water temperature sending unit, oil pressure sender, and fuel tank selector valve/solenoid with connector C209-C339, splices and ground table.
Part of 1978-1979 Ford Bronco Wiring Diagrams
This page (page 31) is part of a 1979 Ford Bronco / F100 through F350 wiring diagram set. It shows the instrument gauge and dual fuel tank circuits: the fuel tank selector switch (fed from Fuse 6, hot when the ignition switch is in Run, per page 9), the fuel gage senders for the aft tank and mid tank, and the fuel tank selector valve and solenoid. It also covers the water temperature gage and its sending unit, and the oil pressure gage and its sending unit, both fed via the printed circuit (PC) behind the instrument cluster. Wire colors are labeled: blue (bl) for the aft tank sender, gray/red (gr/r) for the mid tank sender, brown/white (br/w) for the selector valve, red/white (r/w) for water temperature, white/red (w/r) for oil pressure, and black (bk) to ground. A legend table lists connector locations and descriptions (C208, C220, C306, C308, C314, C324, C338), splices S502 and S805, and grounds G301 (rear crossmember) and G701 ("Y" brace). Useful for diagnosing fuel gauge, tank switching, temperature gauge, and oil pressure gauge problems on these trucks.
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Frequently asked questions
- What fuse powers the fuel tank selector switch circuit?
- The diagram shows the circuit fed from Fuse 6, hot when the ignition switch is in Run (see page 9 of the set).
- Where is connector C306 located and what does it look like?
- C306 is on the LH fender apron, rear, and is a rectangular, green connector with 8 terminals.
- What wire colors go to the fuel gage senders?
- The aft tank sender uses a blue (bl) wire through connectors C306 and C314; the mid tank sender uses a gray/red (gr/r) wire through the same connectors. Both senders ground through black (bk) wires to ground G301.
- Where do the fuel gage senders ground?
- Both the aft tank and mid tank fuel gage senders ground at G301, which is attached to the rear crossmember.
- What wire color feeds the oil pressure sending unit?
- A white/red (w/r) wire runs from the oil pressure gage through connectors C208 and C220 to the oil pressure sending unit.
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