Something else to consider is this: look at the tiny wires running to your headlight bulbs! And think about the tiny wires running the headlight switch! Very little amperage is actually getting to your lights, and amps = power. Do what I did with my 66 Catalina Wagon. If you install a 50A relay up front near each bank of headlights, you can use the headlight power wire to switch the relay on and run power to the lights directly from the battery (thru the relay) using 10 guage wires. The lights will shine much brighter. And you'll keep from burning up your headlamp switch and connector (like mine did). Use four relays, one for each light. It'll cost about $40-$50 for everything. It'* easy to do and I'd be willing to draw a schematic for you.
1988 Grand Am SE 2.0 Turbo
1996 Bonneville SSEi Twin-Charged