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Do you have a multi meter to check for powers at the switch?
Power Distribution Center Fuse #7 powers the Red/White wire at the headlamp switch. When the headlights are turned on, the Light Green wire then powers the headlamp beam select switch. From there the headlamp beam select switch powers the Violet/White wire, which goes to the junction block (inside the fuse box) though Fuses 4 and 5. Next the power leaves the junction block as a Violet and Violet/Red wires that powers the left and right low beam headlights.
You can set your meter to dc volts. The black lead goes to a good ground-usually and unpainted metal on the body. The red lead goes to the wire being tested.
It should read 12 volts. Can you check the fuse #7 and the fuse socket in the junction box for damage? Water, corrosion, melting, etc.
The slot the fuse goes in. There might also be corrosion and damage that can only be seen at the back of the fuse box. If you get to the point where you can't find voltage at the fuse then you might have to check the back of the box.
Ok. Is there power to fuse #7?
That won't work unless you turn the dial to ohms and then it would only show resistance. Check from each of the fuse pins to ground. One lead to one side of the fuse and the other lead to ground. Then between the other side of the fuse and ground. It should show 12 volts on each side.
Sorry. I didn't meant to leave you hanging. I had to run to lunch. I'm at work,
So you are getting power through to the switch.
When you turn the headlights on what do you get to the light green wire?