1999 Ford Ranger Will Not Turn Over

I have a 1999 Ford Ranger 4.0 V6. When I went to start it, it ran for a split
second, then shut off. Since then, when I turn the key, I only get one click (I
think it's coming from my ECM relay), but all of my accessories/lights still
work. I had O'Reilly test my starter and they said it's good. I bought a Chilton's
and it told me to check my starter solenoid between the battery and fuse box,
but I can't find the solenoid anywhere under the hood (see picture, those
disconnected wires are for the lightbar). So I tried to bypass the starter
mounted coil/solenoid (I'm not sure) with a screwdriver, but that just gave me a
pop, some sparks, and everything electrical in my truck shut off. So then I
reset the battery cables and all accessories came back on. I checked each of
my relays/fuses with a multimeter and they all seem to be in working order. I'm
not sure what to do or where to go next?