Had headlights, then high beam only, now nothing

Thank you, for the input on the spare terminal. I figured it had to be a ground, with it on the cover plate, which made me wonder if I needed to make a lead and attach it. I agree, with Rock Auto and use them quite a bit, for a lot of things.

Just to be clear, as to what started all of this, what I've done & what the end result was last night, so we all are on the same page, so to speak:

Driving home from town, a few nights ago, suddenly the low beams went out. I quickly went to high beam. just as I got home, the high beam went out too.

Well, I hit the dimmer switch a few times - Nothing!
Turned the headlight switch off & on a few times - Again, Nothing!

I knew I had another dimmer (used) switch. I checked it, with my meter & it
seemed to function like it should. So, I put that one on, tried it & Again, Nothing!

So, from all I had read, on here & when I googled the problem, the majority of
issues pointed to the Headlight Switch.

I looked around, on the forum, as well. And the next thing I knew, it was 1;00AM
and I started on this, around 8 or 9:00. So, I quit and went to bed.

The next day, I started getting into it deeper. Also, I ordered a headlight switch,
because it wasn't expensive & having a spare would be good. From this point on,
I have checked the headlight bulbs - both work, on high & low beams.
I checked the ground wires that are located by the battery & next to the radiator
& cleaned the them.

A question I have asked and I don't remember getting an answer to, "Is there a
headlight relay? If so, where is it & could That be a problem?

Now, yesterday afternoon, after I actually had to go get the headlight switch
from an O'Reilly warehouse (a little over an hour away), I started working on
replacing that headlight switch. So, I get the switch hooked up & in place. I try it
out. I had high beam, but still no low beam. And when I tried the low beam, there was a heavy discharge on the battery. So, I start it up & on "low beam,
there still was a discharge and the motor was missing! I have absolutely NO idea what happened, to give me THAT problem! Now, yesterday afternoon, before I got home, I had to run an errand, where I came across a series of "speedbumps"
& 1 of them snuck up on me. when I went over it, it was pretty hard on the suspension, which makes me wonder if I somehow damaged something, electrical
yet the charging system only acts up, when on low beam! I am totally confused, as to how or why all of this is going on & I don't know IF the speed bump issue has anything to do with it or not. I just need help, if anyone has had anything similar or feels they can shed some light on this. Sorry about the lengthy post. I am just totally frustrated, at this point. input definitely appreciated.