I have this Toyota Corolla (93 model, 1.6L) and somehow the headlights are erratic. Sometimes, it works just fine, with both operating in low beam and when high beam switch is on, the headlights go to high beam and then the indicator at the dash lights up. However, sometimes, the right headlight would turn off, the left headlight would be constantly on high beam and the indicator for high beam does not turn on anymore. It switches to that scenario every now and then and I cannot figure out why. If anyone can help me because I do not know if it is a relay or ground problem or if the car has some sort of compensation system but I doubt since the right headlight is not busted.

I appreciate any help I can get.
I doubt that it is the switch because whenever the lights work fine, the switch works fine as well. But I will try to look at it as well.

Oh, by the way, the radiator was replaced recently and I was not in the scene when it was replaced so I do not know if there are some wiring affected or touched by the replacement.

Thanks!