Where does the battery negative cable ground on a 1994 Bronco/F-Series?

Per this diagram, the battery negative connects to G103 (Engine) ground, with reference to component location 151-2 A3 and 151-3 (Bronco branch shown to G101 Body ground).

Which PCM pins are grounds on the 1994 Bronco/F-Series gasoline models?

The diagram shows PCM connector C185 with pins 60, 40, and 20 as grounds, all using wire 570 BK/W.

Where do the right headlamp and right front park/turn lamp grounds connect?

The right headlamp (C1034) and right front park/turn lamp (C1032) grounds join at splice S100 and route to ground G101 (Body).

Does this ground diagram apply to all engines?

It's labeled GASOLINE and notes configurations for Lightning, all Bronco, and F-Series with 4.9L, 5.0L or 5.8L under 8500 lbs, a separate C1003 path for 7.5L or 5.8L over 8500 lbs, and a 570 BK/W branch for 5.0L only with E4OD & 4R70W.

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1994 Ford Bronco/F-Series EVTM Grounds Diagram Pg 10-3 - G101 G103 G104 Wiring

1994 Bronco/F-Series ground wiring diagram page 10-3, headlamp and PCM circuits

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Ford gasoline ground wiring diagram for headlamp, fog lamp, mass air flow sensor and powertrain control module circuits to G103.

AI caption June 2016 · Photo 279 of 413

This is page 10-3, "Grounds," from the 1994 Ford Bronco/F-Series Electrical and Vacuum Troubleshooting Manual (EVTM), covering gasoline engines. The diagram traces ground circuit wiring for several front-end and powertrain components: the Heated Oxygen Sensor (HO2S, connector C1025), Right Headlamp (C1034), Right Front Park/Turn Lamp (C1032), Right Fog Lamp (C114, noted for Lightning models), and Right Front Side Marker Lamps (C1053, C1052). These circuits converge at splice S100 and route through connector C1003 (with a note distinguishing Lightning/all Bronco/F-Series 4.9L, 5.0L, or 5.8L under 8500 lbs from 7.5L or 5.8L over 8500 lbs configurations) down to ground point G101 (Body). The battery negative cable connects to G103 (Engine). On the right side, the 4WABS Pump Motor (C122), Mass Air Flow sensor (C130), and Powertrain Control Module (C185, pins 60, 40, 20) grounds use wire 570 BK/W (black/white) through splice S106 to ground G104, with a note that one branch applies to 5.0L only with E4OD and 4R70W transmissions. Cross-references to related EVTM pages are provided for each component, plus component-view locators 151-1 E1, 151-2 A3, 151-3 D1, and 151-3 A9.

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Frequently asked questions

Where does the battery negative cable ground on a 1994 Bronco/F-Series?: Per this diagram, the battery negative connects to G103 (Engine) ground, with reference to component location 151-2 A3 and 151-3 (Bronco branch shown to G101 Body ground).
What wire color is used for the PCM and MAF sensor grounds?: Circuit 570 BK/W (black with white stripe) is used for the Mass Air Flow sensor (C130) and Powertrain Control Module (C185) grounds, routing through splice S106 to ground G104.
Which PCM pins are grounds on the 1994 Bronco/F-Series gasoline models?: The diagram shows PCM connector C185 with pins 60, 40, and 20 as grounds, all using wire 570 BK/W.
Where do the right headlamp and right front park/turn lamp grounds connect?: The right headlamp (C1034) and right front park/turn lamp (C1032) grounds join at splice S100 and route to ground G101 (Body).
Does this ground diagram apply to all engines?: It's labeled GASOLINE and notes configurations for Lightning, all Bronco, and F-Series with 4.9L, 5.0L or 5.8L under 8500 lbs, a separate C1003 path for 7.5L or 5.8L over 8500 lbs, and a 570 BK/W branch for 5.0L only with E4OD & 4R70W.