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This is a wiring issue. If the switch were the issue, the light would not turn on at all. Sounds like something is wired backwards, or there is a cross short. If there is a short to ground, you will be blowing fuses and possibly burning up relays. Consult your vehicle's wiring diagram to ensure the aftermarket headlights are wired correctly.
Nonfunctional Brake LightsOne possible cause of this issue is that the brake light switch is not adjusted properly, or the switch could be defective.
I would start with replacing the head light switch
You have a bad ignition relay switch. I had the same issue with a Mitsubishi galant.
it is an electrical issue
Make sure the bulbs are there and in good condition. If the tailingts work it would not have been the switch. There is an issue with the wiring between the switch and the lights. Check the grounds for the lights and check the wiring between the switch and the bulbs.
Turn off engine. Depress Emergency Brake. Turn on engine. The lights will not turn on until the E-Brake is released. Get in the habit of setting the E-Brake and you will have less of an issue with the auto headlights. I don't think there is an easy way to bypass the auto headlights entirely. The headlight switch is essentially, "just for show."
normal
because the battery is the source of the power for the headlights. there could be an issue with the battery or the alternator can be failing.
Possible ground issue at the taillights.
Probably have a "dimmer switch problem" The switch is mounted on the side of the steering column and can be replaced easily. Using a test light, 3 wires are at the switch. the wire coming down from the headlight switch that should be hot when headlight switch is activated. The other two are outputs which go to the high or low circuit of the headlights respectively.Easy to fix with a 12 volt test light for troubleshooting.
You probably have either a grounding issue, or insufficient current.