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I believe the problem is related to the ignition igniter. Best to replace the dist with a reman unit.
Where the nut threads on at the threads the edge of the nut has a "stake" that holds it from backing off after tensioning. Look hard, you will see it. sometimes it is just where someone has used a brass hammer and just tapped to flatten the surface.
Is likely a part of a multi function combination switch and will have to replace the whole switch or the half if can be seperated. The detent has failed and will not hold high beams on.
You will see a small diameter line at the a/c evap area that will have a threaded line. When you unthread and seperate you can look in the line that is exposed and see the orifice. There is a special tool needed for removal. Sometimes these can ger stuck and be removed with needle nose pliers. I have seen them stuck so bad that either you replace the evap or can try a patch kit after cutting the line.
You will need to remove radiator and likely the grill as needed for access. Also any other coolers in the way.
Your front brake pads are creating that dust as they wear down. You may have poor quality pad material causing this. You can clean the wheels and install a top quality brake pad and drive to see what happens. I strongly recommend replacing any pad shims and/or hardware and machining the rotors or replacing them. If you have rear drum brakes then the drums are keeping the brake shoe dust off the rear wheels.
I wish I knew the test procedure but I would be thinking that unless you have a bad fuel distributor that I would be leaning toward the hall effect switch in the ignition distributor. It is an on off switch to help fire injectors. Maybe someone on here has the test procedure or you can locate online.
I am a little confused why you replaced the fuel pump and relay if you knew you had no spark. Locate your ecu and check all connections.
Check any related fuses and relays. See if has proper power and grounds at motor. Likely a motor failed.
Found online: Check or unplug the door,trunk and hood sensors. That's the only thing that sets them off. There may be sensors getting wet from a water leak setting off the alarm. Inspect the sensors and see if getting wet. Can unplug one at a time and see which one could be causing it.