A problem started, as I ran low of gas one evening. I stopped at a station, put some fuel in, and while on the freeway the engine completely shut off. I coasted to a stop, and it wouldn't turn over, as if it was out of fuel.
Long story short, I got it home and checked the fuel pump amperage, spark ignition and finally the fuel pump relay. I switched a "good" relay I had with the old one, and suddenly it worked! So, I thought, "well it's just the relay," and replaced it. Strangely enough the cruise control that was mysteriously broken, worked again.
Anyways, I thought it was fixed, when the exact same thing happened again. The engine shut off, and it wouldn't start again. After waiting and trying, it somehow turned over, and I drove it home.
Now the strange thing is that recently while on the way to a parts store, (yes, I was still driving it)I noticed the rear defroster turned on,(even though I didn't turn it on) and the right directional was also "stuck" on, not even pulsating. The rear brake light bulb-warning light on the dash panel, also started showing. I pulled over to re-set the system, by turning the ignition off and on again. The dash panel, directional and rear defroster stayed on, even with the key off.
Well, I drove home and shut it off, and after a few seconds, everything finally shut down like it should.
So, what is it now? The ignition, or a wiring harness? After all the electrical malfunctions, I kind of ruled out the fuel pump as a problem, but what might it be? Any help would be appreciated.

89' 245 DL B230 5spd normal aspiration