98 Corolla, I think engine is 1.8L, 160,000 miles
I'm a pizza delivery driver - I got to work fine, took my first delivery without issue (car always starts strong, nothing weird about turning the key in the ignition, etc.). I got to my car with a second delivery...at first, nothing at all was working. Not the power locks, not the windows, nothing at all. I turned the key to start, all I got was crazy clicking that continued even after I removed the key, I traced back to the starter relay
(I think that's what it is, in the engine components fuse box but it's not a traditional fuse, I could put my finger on it and feel the clicking).
My battery (1-year old) terminals had recently been corroded, although they seem okay currently, so I thought it might be a connection. I messed around with a cable connected to the battery, the alarm went off for just a second and then stopped. I got back in the car, and I slowly started getting power back - eventually, dash lights came on normally, radio and AC worked...but still, all I got was the crazy clicking when trying to start the engine. I removed the alarm system/horn fuse so it would stop going off.
It seemed like the alarm continued to try going off - the hazards were flashing, dash lights flashing, even with the key out of the ignition.
I checked all of the fuses that have to do with the starting system (I think), nothing there that I found suspicious. The starter hadn't given me trouble in the past, that's the only reason I'm not suspecting that. I feel like it might be the solenoid? Could it be a weak connection from the battery, which maybe drained it, and now it's not giving out enough voltage to close the magnet in the solenoid? Any advice would be greatly appreciated, I had to leave it at work as I won't have the money to tow it or have it looked at by a mechanic (if necessary, I can do some stuff) until Tuesday.