>> But I'd also recommend running relays and new, bigger wires to all
>> the lights for the optimum performance for any lighting system.
>
>I didn't find this to be necessary.
>I measured the voltage drop through the headlight switch and stock wiring
>and found it to be insignificant on my 90 Westy... perhaps that is not the
>case with older Vanagons that have created more corrosion over the years...

When I did the SA Grille install on my sister Melissa's Westy we also
added a relay and 10/12 gauge wiring direct from the battery for the SA
driving lights.  The voltage delivered to the SA driving lights was .75
volt greater than that delivered via the factory wiring harness to the 7"
round H4 hi/low headlights.

As Bill points out above, this may not always be the case, but on this
van the extra effort paid off.  3/4 of a volt is a BIG difference in
light output.

Tony

Anthony L. Mourkas
Hampden, Maine, USA
1984 Vanagon Westfalia
1991 Jetta Eco Diesel
1991 Volvo 240 sedan