Taillights, high beams, and manual headlights not working properly

Hi,

I need to confirm something. You indicated the tail lights aren't working first, and then indicate the parking and other rear lights are working. Please explain.

Next, I have attached a portion of the wiring schematic relating to the headlamps. First confirm the headlamp fuse itself is good and there is power to it.

If the fuse is good and there is power in and out of the fuse, then I need you to check the two relays I circled in the pic.

Here are a few links you may find helpful when testing:

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

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If everything checks good, then I suspect the switch is bad. However, let me know what you find before replacing it.

Take care,
Joe