Most visitors online was 1660 , on 12 Dec 2020
Quite often they're not visible, either. Same on radios and TV's. Modern lead-free solder is worse.one more thing I’ll add is that automotive electronics from this era suffer quite often from what is commonly termed “cold solder joints”.
what happens is the solder cracks and breaks quite often, either from age, vibration, corrosion or faulty soldering when assembled.
Not too grim when you can fix it!Just be sure to clean any grim or corrosion off the joints before reflowing the solder.