To find it:
1. Locate the under-hood fuse box: This is usually a black plastic box near the battery.
2. Find the fuse box diagram: There should be a diagram on the inside of the fuse box cover showing which fuse controls what.
3. Look for the fuse labeled "Cigarette Lighter," "Power Outlet," "Accessory," or something similar. The amperage rating might also be indicated (usually 10A or 15A).
If you can't find it in the under-hood fuse box, *it's less likely but possible* the power may be routed through an interior fuse box (some models had these). This would be less common for the cigarette lighter itself, but its worth a check if you can't locate it under the hood.
Recommendation: Use the diagram in your owner's manual (if you have it) for the most accurate location. Failing that, a quick online search for "1990 Ford Bronco II fuse box diagram" with images might yield a helpful diagram matching your vehicle.
