I bought my first CAR, a 1982 Toyota Tercel, brand new with 4 on the floor. It was great. I drove it for about 4 years, enough to pay it off when the company I was working for gave me a "company car" to use . It was a rusting boat that had weird problems. The idle was adjusted so high that if you took your foot off the brake it would eventually get itself into 2nd gear rolling forward. It was a distaster, electrically. The radio would abruptly and randomly change stations, when signaling a turn the dome light on the roof would flash . The battery was so weak you couldn't start the car twice in succession without driving enough to recharge the battery. But enough about it. I parked my Tercel with a sticker on it that declared "THIS CAR IS NOT ABANDONED!" In the meantime I met my wife and began driving her car, a Ford. After about 6 mo the Tercel just disappeared. I never found out what happened to it.
The vast majority of times, such weird electrical symptoms in cars are due to Earthing problems!!
Resulting in many strange faults, as the current back-feeds elsewhere to earth...
That's surprising too because Japanese cars of the era tended to have impeccable electrical systems. If it was rusting to pieces though that suggests one of those awful places where they salt the roads, uhg. All bets are off when it comes to rust.
I'm surprised, too, as my sister had a "Turtle" for years, without a hitch.
I borrowed it for while once, & discovered a strange fault----- it was 4WD, & sometimes the rear end could "wind up" (silly term, but that's how it was described to me), on the front drive, locking the transmission.
There was an easy way to "reboot" everything, which wasn't included in the Owner's Manual, so I added a note to my sister's manual.
The salt thing reminds me of living in Southampton UK & seeing cars which would have pretty much been in their "adolescent" years in Australia, pretty much rusted out.
They were believers in salting the roads, as well as adding "chippings"(small pieces of hard rock, similar to those used in roadbase).
A better recipe for underbody rust couldn't be found!
It's not as if the weather was that savage----it only snowed twice in the 10 months or so I was there.