The wiring is designed to carry a certain electrical load. Usually, the wiring can carry more than the stock load (the light bulb), but not neccessarily.
The circuit needs a power and a ground. Changing one and not the other will not help carry more load. I looked at the factory service manual, and the wire gauges are not listed.
If the original light bulbs are 55 watt and you put in 130 watt lamps, you run a risk of over loading the wiring. Changing the ground wire won't do you any good unless you also change the power feed wire.
You also need to consider the relay and the wire feeding the relay.
If you are upgrading to something just a few watts higher than stock, you'll probably be fine. You'll need to know the existing wire gauge and the wattage of your new bulbs to be sure.