Originally Posted by casper124
The high beam and low beam are separate lights. Its the low beams that flicker so your theory of lower voltage is probably correct and a relay is needed. And yes the flicker disappears when headlights are turned on.
OK, Here is the first thing I would consider, assuming that you don't mind losing your Daytime Running lights.
If both left & right LB are connected together, you need one relay, if they are separate, you need two relays.
Under the dash, you can find a wire from the headlight switch which goes hot when you turn on your headlights. Use this wire to drive the relay coils.
Cut the wire that feeds your LB filament (now your ballast).
Using the N.O. contacts, repair that cut. Now the LB are disconnected until you turn on the headlight switch, then the normal connection is returned.
To still have DRL, one option is get some of the LED Driving light strips. They should work at 9v or so. Connect them to the open terminal on the relay (N.C.). They will work as before, and turn off when headlights are activated.
I can provide a schematic if you need more info.