The stock H7 bulb is 55 W,
https://www.sylvania.com/en-us/appl...tems/Pages/lrgproductspecs.aspx?partnumber=H7 so you are looking at approximately 1 amp difference. Wattage = Voltage X Amperage or Amperage = Wattage/Voltage. The wiring should be capable of handling that additional current as Ford_6L_E350 mentions.
One point to mention is the longevity of the bulb may be slightly less due to the increase heat inside the headlight housing. I know that I have installed the 9005 in place of the 9006 in my fog-lights but with the higher light output comes shorter bulb life.
Actually, in this case the issue isn't the heat it's the smaller filament being driver harder to produce more lumens. The 9006 is rated at 1000 hours service life. The 9005 is rated for 300 hours service life.
Oh, but if you want serious lumens from your fog lights you should try a HIR 1 bulb which has in excess of 100% more lumins at the same power rating (65W)...and is rated for a longer service life (350 hours). Best part is that other than the plastic locating tabs it's a drop in replacement in virtually all cases. However, if you want similar lumens of your 9006 but the most of the service life of a 9005 you can use the HIR 2 bulbs.
FYI, the way the HIR bulb gets more lumens is that it recycles the infrared to produce additional filament heating allowing for less heating needed from the electrical current. So in effect with an HIR 1 bulb you may have effectively a 120W bulb but with only the heat of a 65W bulb. Best part the bulbs are DOT certified and even used in certain production cars such as the Viper.
Needless to say: Make sure your lights are properly aimed and when used in place of high beams insuring you go back to low beams LONG before you get close to traffic in front of you.