installing higher wattage bulbs, thicker wiring harness?

Z22_Z33 said:

It's always nice to do things all at once. If your going to non sealed beams, just the regular halegon bulbs (like H4s), you need to change the connecters, as the ones for sealed beams wont work with regular halegons(I believe), so you may as well do it all at once, the connectors to the wires. You may after a while want to change to higher wattage bulbs, and in that case you'll be happy you upgraded.
Heres a page you could use from go jeep. Might save you some money, instead of buiying a whole setup from a company.
http://go.jeep-xj.info/HowtoHeadlightLoom.htm
Here another page from 4x4 wire, complete with pictures.
http://www.4x4wire.com/jeep/tech/electrical/ipf_h4_01/

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ZmOz said:

You don't NEED a new harness, but you definately should get one. Even for stock lights this is a big improvement. Most XJs with the original wiring are lucky to get 11.5v at the lights - if you can get the full 13.5-14.5v from the alternator to your headlights, they will be about 50% brighter.

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ZmOz said:

H4s and sealed beams use the same connector.

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