If they are Halogen O.E. replacements...which surely they are...mine still had factory incandescent high beams(Westinghouse)...imagine that...I upgraded all the lights to halogen replacements... Well, after driving for a while...the headlights would flicker...that's not a good feeling...if I used the high beams...they would flicker in about 2 minutes...untill I turned them back to low beam. The old system was designed for incandescent-low wattage bulbs...the light switch and wiring is not made for halogens. About the only logical choice you have is to relay the headlights, if you know how to wire a relay...it's a breeze...power and ground...switched posts going to the high or low beam post on the bulb...and the switch post on the relay is the factory headlight wire...since it pull so little amperage to switch a relay...it will take a lot of load off the switch...which is always good. I had drawn a diagram out...but my hard drive crashed and I lost it...I used 4 relays on mine. Now I'm running lined H4 upgrades from pepboys.com...they are really a good quality replacement...glass/metal...and they are a good price...if you ever wanted to upgrade. Mine are extremely bright now...I can actually see the road ahead of me now...

______________________________________
'73 Montego MX 357C Homebuilt EFI, 9.5:1 comp, mild cam, 30lb injectors, A9L computer, Moates.net chip, 70mm TB, 76mm C&L mass air.