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If the high beam switch is broken that it should be replaced. When the unit is replaced the high beams will work again.
First double check the bulbs to be sure they are good then I would suspect the high/low beam switch or the headlight switch is at fault.
Have you checked the daytime running light module?
Bad switch or wiring problem.
headlight switch
The contacts in the dimmer switch, on the steering column, may be burned from the headlamps being on all the time. The switch has to be replaced. First check the low beam lamp filaments with an ohm/multimeter for continuity.
bad light switch.
check multifunction switch, modules & relays
The dimmer switch is located on the turn signal lever. Pushing it forward will activate your high beams.and pulling back will return you to low beams.
a loose wire or a broken switch inside the cab
the problem is the switches themselves, just poorly designed.
Often it can actually be a faulty turn signal!! As silly as this sounds it is quite common. First thing to do is clean the contacts on the turn signal, if you still get high beams and no low beams you probably need to replace the turn signal switch.