You may so I would recommend getting an aftermarket harness like this one:
http://suvlights.tripod.com/suvlight...re-harness.htm You could build you own, but the price is so low, I wouldn't bother to take the time.
It is really cheap insurance.
Also, make sure to aim your headlights properly after installing the new bulbs. With non stock bulbs, don't trust the bubble levels, use an aiming wall to properly aim the headlights.
Doug