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The big battery-ground to engine is primarily for starter.
All other circuits have their own ground-wires connected to main black/yellow trunk that goes to battery ground terminal. Since everything is not working, I suspect one of main trunks that everything connects to. Inspect ground-terminal clamp at battery. Then measure resistance to battery negative terminal from opposite ends of ALL other ground wires (bulb-sockets, igniter, etc.). Make table in Excel and record your readings, a pattern may appear that helps.
Or it could also be power-distribution. Pretty much ALL circuits get power through ignition-switch. So measure resistance between power-input terminal of ignition-switch to power-output terminals. Also measure resistance from ignition-switch power-outputs to opposite ends of each circuit.
For example, between ig-switch output to positive-terminal of tail-light socket (with key on). This measures resistance of power-cable to ignition-switch, to output terminals, to wire between ig-switch to fuse-box, then through fuse, then through wire between fuse-box to tail-light socket.
Could be power-wire between ig-switch and igniter.
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