Donor cables hooked up correctly receiving car cables reversed. Didn't start, smoked. Mechanice shop portable jumper then used receiving car again had cables reversed. Again smoked, didn't start. Then a friend checked said Alt fuse blown replaced with a 75 watt instead off 100W with instructions to replace right away. Checked battery and alternator with machine(?)checked out ok. Took car to shop replaced alt fuse and radio fuse. Said battery was shorted and alternator no good. Is this possible with regard to battery and alternator?
I've accidently had the the battery cables hooked up wrong once, but I quickly removed them and redid it with no ill affects.
If you don't check them regularly, like once a year, the battery/alternator hookups could affect each other with one causing the other to go out sooner. I've had it happen several times. You can buy a simple battery/alternator check device, I think for less than $10 USD.
This is what I use to check both twice a year, but if you took it somewhere and it checked out on a machine, I would go with that over the verbal of a shop, unless you really know their reputation.