Recently, I have replaced the headlamp switch after finding a wire
burned. The wire was the 18 gauge black / lt blue  from the switch to
joint connector c.  After tracing the wire using a schematic I
replaced the wire from the main junction under the brake, bypassing
joint connector c.  everything worked great.  While removing the bezel
the headlamps were on low beam and began to fade in and out.  Suddenly
just remaining unlit. I have checked the switch and the wires all is
ok.  Also checked the low beam filaments in the headlamp bulbs.  Still
no problem.  The highbeams still work fine.  Is there a relay or
something that I am overlooking or can anyone tell me what the problem
might be.