Every time a fuse blows there's a surge...surges = very bad for electronics. Some of that surge makes it through before the fuse clears the fault. If it happens enough, some weaker, or aged, electronics will 'mysteriously' fail later on.Ronzuki wrote: I always plug stuff like that in before I start the car (power off). Then, everything in the car powers up at the same time.
I stand by my earlier staements and comments. Many, many years of industrial field troubleshooting work to back it up.
As to the comment of electronics have to be robust, very true...but....should be robust and profitable are not synonymous in the world any longer. Robust enough to make it out of warranty, yes. After that profits rise as was indicated above by elevated diagnosis charges and incredibly over-inflated prices for the mysterious black boxes.
I had to throw a lousy 2 year old toaster away recently because the circuit board controlling an electro-magnetic latch in it wouldn't hold the lever down. What did we do? Pull out the nasty looking 20+ year old toaster we still had and are now using it again.