If the high beams on your 2002 Freightliner are functioning but the low beams are not, the issue could be due to a blown fuse, a faulty headlight relay, or a problem with the low beam bulbs themselves. It's also possible that there is a wiring issue or a bad ground connection. Checking the fuses and relays related to the headlights is a good first step, followed by inspecting the bulbs and wiring for any damage. If these components are all in good condition, seeking professional help may be necessary.
fuse, bulbs or switch
Bulbs are burnt. replace both. low and high are together in the same bulb.
Check bulbs Check hi-low switch
Your high beams work but your low beams do not because the switch is broken that switches between high and low beams. Electrical switches wear out.
Well, first i would replace the low beam bulbs, if that doesn't work, perhaps a fuse, and if not that, wiring problems.
If low beams do not work and the high beams of a Mitsubishi Eclipse do, it is probably due to a corroded connector. Simply clean the connector and add some petroleum jelly to the terminals.
Take your car in to have it checked. Turn signals should work without high beams.
First check the bulbs, if the bulbs are good I would suspect the high/low beam switch is bad.
As a guess both low beams are burnt out The daytime running and high beams are the same light filament. Or the fuse or the relay for the low beams.
check the bulb low bean burns out before high beams
your bulbs are burnt out. when you switch on the high beams its only the high beams. but when you flash your brights it lights up both high and low beams.
It's the same switch as is used to turn the headlights on, just pull it out. The driving lights will not work at the same time as the high beams so make sure the high beams are turned off.