If you put 100/80 watt bulbs in... then you will need to do a wiring upgrade
which will allow the current to flow directly from the battery, through a
relays, to the headlights.

The current original lighting setup routes all the current through the
headlight switch, which will burn up and melt away if you add more wattage.

In short, yes, you can use those bulbs, but only with the wiring upgrade.
Info on how to do it is all over the archives, as well as on vanagon.com

I would recommend doing the upgrade anyways, as you will get more voltage to
the bulbs, and notice even more light from your old bulbs!!  If you are
interested in really seeing at night, send me a pmail, and ask me about the
used E-code H4 headlamps I have for sale.

RSF

IMPORTANT!!! In order to reply to me, you must have the word "FISH"
somewhere in the subject line of the email.  Otherwise it goes directly in
the trash.

<�)))>{   <�)))>{   <�)))>{   <�)))>{   <�)))>{   <�)))>{

Robert S. Fish
Salzburg, Austria
1987 Wolfsburg Vanagon 2.1 GL Weekender
1987 Golf Cabriolet
1991 Golf

> would anyone know, if I can use an 80/100 watt, 9004 bulb in my main head
light housing? Here's a link I found, which lists some nice bulbs. I thought
86 +Vanagons used 9004 bulbs, but I can't remember.