Where do the rear lamp grounds on a 1994 Bronco connect?

The left rear park/stop/turn lamp (C431) and left backup lamp (C433) join at splice S406, and the right backup lamp (C434) and right rear park/stop/turn lamp (C432) join at splice S405. These pass through connectors C406 and C405 to splice S401, then with the license lamps and fuel pump/sender ground to splice S400 and connector C205, reaching ground point E via C202 (see page 10-2).

What wire circuit grounds the fuel pump/fuel gauge sender on the 1994 Bronco?

The fuel pump/fuel gauge sender grounds through connector C441 on circuit 89, an orange (O) wire, joining splice S400.

What is the ground wire for the instrument cluster on 1994 gasoline Bronco/F-Series trucks?

The instrument cluster (pin 10, connector C250) grounds through circuit 398, a black/yellow (BK/Y) wire, passing through C202 and C101 (component location 151-1 E9).

Which connector grounds the heated oxygen sensor (HO2S)?

The heated oxygen sensor grounds through connector C1025; details are on pages 25-4 and 26-3.

What do the * and ** footnotes on the manual lever position sensor mean?

Per the footnotes, * means with the 4R70W transmission (pin 5) and ** means with the E4OD transmission (pin 8) at connector C1012.

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1994 Ford Bronco/F-Series Ground Wiring Diagram - EVTM Page 10-5 Grounds

1994 Bronco/F-Series ground wiring diagram page 10-5, lamps and A/C clutch circuits

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Ford ground wiring diagram showing park/turn/backup lamps, A/C clutch coil and heated oxygen sensor grounds.

AI caption June 2016 · Photo 278 of 413

This is page 10-5, "Grounds," from the 1994 Ford Bronco/F-Series Electrical and Vacuum Troubleshooting Manual (EVTM). The left diagram, specific to the Bronco, shows the rear lighting ground circuit: the left rear park/stop/turn lamp (C431), left backup lamp (C433), right backup lamp (C434), and right rear park/stop/turn lamp (C432) ground through splices S406 and S405, then through connectors C406 and C405 to splice S401 along with both license lamps (C435, C436). The fuel pump/fuel gauge sender ground (C441, circuit 89, orange wire) joins at splice S400, which routes through C205 to ground point E via C202 on page 10-2. The right diagram, for all gasoline models, shows grounds for the A/C clutch field coil (C163), A/C clutch diode, instrument cluster (C250, circuit 398 BK/Y through C202 and C101), manual lever position sensor (C1012, pin 5 with 4R70W or pin 8 with E4OD), and heated oxygen sensor (C1025). Engine/transmission-specific routing is noted for 4.9L, 5.0L, 5.8L, 7.3L with E4OD, 7.5L, and M5R2/T18/4R70W/C6 transmissions, with paths A and B leading to splice S102 on page 10-1. Page references for each component are included.

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Frequently asked questions

Where do the rear lamp grounds on a 1994 Bronco connect?: The left rear park/stop/turn lamp (C431) and left backup lamp (C433) join at splice S406, and the right backup lamp (C434) and right rear park/stop/turn lamp (C432) join at splice S405. These pass through connectors C406 and C405 to splice S401, then with the license lamps and fuel pump/sender ground to splice S400 and connector C205, reaching ground point E via C202 (see page 10-2).
What wire circuit grounds the fuel pump/fuel gauge sender on the 1994 Bronco?: The fuel pump/fuel gauge sender grounds through connector C441 on circuit 89, an orange (O) wire, joining splice S400.
What is the ground wire for the instrument cluster on 1994 gasoline Bronco/F-Series trucks?: The instrument cluster (pin 10, connector C250) grounds through circuit 398, a black/yellow (BK/Y) wire, passing through C202 and C101 (component location 151-1 E9).
Which connector grounds the heated oxygen sensor (HO2S)?: The heated oxygen sensor grounds through connector C1025; details are on pages 25-4 and 26-3.
What do the * and ** footnotes on the manual lever position sensor mean?: Per the footnotes, * means with the 4R70W transmission (pin 5) and ** means with the E4OD transmission (pin 8) at connector C1012.