After giving it some more thought, my guess is that the parking light wire is cut to disengage the OEM parking light, and the signal on the driver's side is used to trigger low/high intensity on the new LED drl lights. If this step is skipped, I believe the DRLs will remain in either the low/high intensity(if the no signal case is high intensity, they may now not be "street legal", and if the no signal case is low intensity, they will not be as bright when the headlights are not on), but you would gain the ability to reverse the install if needed.
I don't believe it actually draws any power from this wire on the driver's side, but it is rather used as a sensor of what the OEM setting is. I wonder if it is possible to tap into that signal without actually cutting the wire.
Originally Posted by dasilvarsa
It's a pity that you need to cut a wire.
Otherwise the mod is completely reversible.
They look like factory fit and definately worth the money.