It sounds like a ground problem. I will also recommend looking around the radiator for loose ground wires. You might also want to trace the wires from the headlights themselves and locate their ground.
Take care
~Chris
------------------
Retired Moderator
MustangNet
My site:
JimPorterRacing
RACECAR spelled backwards is RACECAR
HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!