Heavy duty wiring harness for H10's?

Those are only rated 55W, so no you do not need the thick harness. You need a thicker harness for the 80/100W bulbs.
 
Just look up H11 pigtail on Ebay. I got a set of those (they're pink and white) and they come with 14 gauge wiring. The stock fog light wiring is 22. So you may want to upgrade that if you plan to use higher wattage bulbs.
 

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