To find the correct fuse:
1. Consult your owner's manual: This is the most reliable source. It will have a diagram showing the fuse box layouts and identify which fuse controls the high beams.
2. Check both fuse boxes: Carefully examine the fuse diagrams in both fuse boxes (under the hood and inside the car). Look for fuses labeled "headlamps," "headlight," "high beam," or something similar. The fuse rating (e.g., 15A, 20A) might also be indicated.
3. Look for blown fuses: Inspect each potential fuse using a visual inspection or a test light to see if it is blown (broken filament).
Important Note: If you're not comfortable working with car electrics, it's best to take your Mondeo to a qualified mechanic to have them check the high beam circuit. Incorrectly handling fuses or wiring can cause further damage.