To find it, you need to:
1. Consult your owner's manual: This is the most reliable source. The manual will have a diagram showing the fuse box location(s) and a legend identifying which fuse controls the power outlet.
2. Check the fuse box(es): Suburbans often have multiple fuse boxes, one under the hood and one inside the vehicle (often under the dashboard, near the steering column, or in the center console). Look for a diagram inside the fuse box lid – it will show you which fuse is which. The fuse may be labeled "Power Outlet," "Accessory," "Cigarette Lighter," or something similar.
Without knowing the year and model of your Chevy Suburban, it's impossible to give a precise location.