'93 Bronco Grounds; '87-96 Bronco/F-series similar
IF THE IMAGE IS TOO SMALL, click it.
This diagram is compiled for a truck without E4OD or ESOF, and a 4.9L engine (which wasn't offered in a '93 Bronco). Splice 207 has been corrected. Note the unnamed connector (C2??) near S207: it's a 1-pin gray connector taped into the main dash harness (14401) 6" left from the chime takeout.
This diagram does not show the radio suppression bond straps running from the frame to the body, which are not power grounds, and neither are the 2 that ARE shown between the blower resistor & EEC. One of the straps NOT shown goes from the RHF sway bar tab to the core support; another goes from the 3rd LHS body mount bracket to the cab structure.
It's possible that the G100 circuit is linked to
G101 inside the HCU. Some later trucks have G104 linked to G100.
G102 isn't an official Ford label, but this is what I use it to identify:
Motorcraft F2TZ-14301-B Negative Battery Cable with body, frame, & block grounds
See also:
http://www.bbbind.com/tsb-wiring-diagrams-database/
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For '79 & similar trucks, see:
http://www.supermotors.net/registry/24302/78593-2___________________________________________________
"Grounding" is commonly misunderstood...
When electricity first became publicly available (when Edison & Tesla were fighting over DC vs. AC), Copper wire was very expensive. So rather than run 2 wires everywhere, Tesla realized he could run a "hot" wire, and then use the ground (the actual dirt of the Earth) as the return circuit path. (He also thought he could use the ionosphere as the hot side, but he never got that to work.) Inside a house, there still had to be 2 wires, but one of them went "to the ground" via a Copper rod driven into the dirt outside the house. That became known as "the ground wire". When vehicles acquired electric circuits (AFAIK, the first on any Ford was the electric horn, which Ford always numbers as circuit #1), it was equally-efficient to use the metal chassis of the vehicle as one of the main electrical pathways, to reduce the amount of wire needed. And the term "ground" was carried over into that arena. Chassis grounding worked reasonably-well until alternators got up into the ~100A range (in the 80s) and vehicle wiring harnesses began to exceed the weight of the drivetrain (AFAIK, the first to cross that line was the '92 Lincoln Continental V6). Since then, more circuits are networked through high-speed data bus lines via communication modules so that you don't need a discrete wire running from one end of the vehicle to the other & another coming back to turn on a taillight, and confirm that the bulb isn't burnt out.
But as a result, the chassis/body ground is no longer sufficient to provide a reliable circuit path without introducing a lot of background noise (RFI) into those minuscule high-frequency data signals. So the trend for a couple of decades now has been to run actual Copper return wires so that far less current flows through the chassis steel. (House wiring standards added a return "neutral" wire decades before that.)
So by definition, if you're using a wire to return to the battery, you're not "grounding" that circuit - you're wiring it. And wiring it is a good idea when you're dealing with rusty 40- to 50-year-old body & frame steel. The catch is that the return wiring has to be AT LEAST as large as ALL the power wiring that it serves - IOW, very big like the alternator output wire, the starter wire, the winch wiring, and the ignition switch battery-supply wires. None of it needs to be bigger than the battery cables because you can't ever get more current flowing than the battery can put out (roughly whatever its CA rating is).
So if you want to be sure you have a good return path throughout any vehicle, just extend the battery (-) cable all the way to the trailer connector. Obviously, you can't run a cable that big into the trailer connector or anything else - you have to splice onto it to branch off with smaller black wire (or whatever color the particular circuit uses for "ground"). That's why I refer to that as a "trunk ground" system - the main return wire is like a big tree trunk, with the variously-sized smaller branches shooting out to hit each point on the vehicle that needs an exceptionally-reliable return (generally: the high-current devices; and those that require low RFI noise, like audio amplifiers).
Fortunately, those splices DON'T need to be insulated - they can be left showing bare metal. Copper & solder don't corrode very quickly in air, or even in common rainwater. Mainly just at the battery where acid leaks out. Road salt will eventually cause some corrosion, but probably not enough to matter within the remaining lifespan of even the best-maintained antiques.
And the body & frame should still be GROUNDED at a few points, just to reduce galvanic corrosion, and to serve the very-low-current chassis-grounded loads like taillights & fuel level senders.
Some vehicles also have large un-insulated woven wire straps joining large metal components, but those are not power grounds. Those are RFI grounds, used to reduce the amount of electromagnetic noise passing through those components.
