SOURCE: cant turn my w202 head lamps on from the switch
Check out your main lights relay and the associated fuse. If you have someone switch the lights on whilst your under the hood you should be able to hear the relay 'click' as the contacts are brought together. If the relay is dead check that when the switch is turned on that power is getting through to the relay. If the relay is clicking check that power is coming out of the Switched circuit. Now check the fuse, note this will only carry power if the dashboard switch is on and the relay is functioning. Check your bulbs
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