Is the alternator on a ford focus 1.6 the same as

They are long!

https://www.oreillyauto.com/shop/b/charging---starting-16772/alternator-bolts-17565/5dfd8ce98dac/v/a/5417/automotive-car-2000-ford-focus

and

https://www.google.com/search?q=2000+ford+focus+alternator+bolt+size

..

ford Focus can be changed out, if loose, there is a 1 amp fuse in the under hood fuse box for the alternator charging signal

alternator commuator worn out ,they are too small and they wear out before the brushes ,renew the alternator

you did not state which engine you have but if you are not real handy and/or have experience this is not one you should tackle as your first alternator because...
all will require that you either drop the rear of the subframe or rotate the engine forward to remove the alternator.

everything else is the same...remove the belt, unbolt and remove

about an hour job with experience and two hours if a first time

Autozone or a similar parts retailer will print one for you for free.

you have to remove the axel shaft and the top bracket and then pull the alternator out

Very possible if they were from auto zone or cheap knockoffs,Best to have original rebuilt or buy buy factory alt.

what to do to a2003 ford focus if the alternator wire shorted out

There is a 1 amp fuse in the under hood fuse box for the alternator charging signal. Also, there is a 175 amp fusible link for the alternator, which is located under a plastic cover, next to the top of the timing belt cover.

yes remove the mount bolt and drop the engine to remove the alternator