You can Neil, but what you may run into when you put brighter bulbs in
both/either headlights, is the dreaded switch failure. That's the reason for
the upgrade, where people put relays into the lighting system so the switch
acts only as an on/off device, not a current carrier. And yes, the lights
are 9004.

Link to Ken Lewis's  wiring diagram:
http://www.members.shaw.ca/albell/mods/lightcircuit.html

...and Frank Condelli's:
http://members.aol.com/Fkc43/hdltrela.htm

I've installed the relays, and also have brighter bulbs, and they work
great. I had the headlight switch failure problem and after installing the
relays, it went away.

Bob

http://groups.msn.com/BobsPhotoShare

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