this is a stock headlight setup
the yellow is hot from the headlight switch.
the white box is the dimmer switch.
the tan wire is for the low beams
the light green wire is for the high beams.
that is a standard GM color coding for headlights.

if you want 2 lights for low beam and 2 lights for high beam wire it like this

if you want 2 lights for low beam and 4 lights for high beam
you simply splice in a wire (i used red) to side step the dimmer switch's low side.
now your outer lights will be on as soon as you turn on the head light switch.
and all four lights will be on when you click the dimmer switch in to the high position.

[This message has been edited by buddycraigg (edited 12-01-2005).]