the best thing i can tell you is to go over it again to check for a short
when you reverse connect a battery there is a good chance you will blow the main fuse this will protect the car from more damage but usually stops the battery for been charged as well... check and change the main fuse or fuseable link The alternator probably already was bad before you put the battery in.
have you checked the fuseable link? It is a black wire like link, closest to battery in fuse box in engine compartment. Give it a tug to verify it is not burned out and outer casing is hiding this condition. The fuses are blown. maybe even the main power fuse which should be about 100 amps. before replaceing it check for any shorts in the battery cables.
Think before you speak.
Answer I had 76 Ford years ago and had the same problem. I bought several batteries and a alternator and kept blowing fuse links. Believe it or not I stripped my battery cables and they were corrodied internally, looked like they may have been aluminum replaced them and my problem was solved. Good luck!Change your alternator because it sounds like its shorted to ground internaly get a used one and replace it to try before you buy a new one. and insted of using fuseable links try a test light to see if it lights up when you connect the alt. if it does look for melted or burnt wires.
The fan motor is going bad. It is drawing way to much current and that is why it is blowing the fuse. Bearings are probably going bad. It is just a matter of time before it fails completely.
When a battery is slowly drained over a long period such as by a stereo memory or a clock,a type of corrosion accumilates between the battery post and the terminals that will diminish the voltage carrying ability of the wire, and your battery is probably bad as well. Before buying a new one have it checked for voltage and draw. Before reinstalling it clean the inside of the battery terminal connectors and the battery posts so that you have clean and shiny lead. When you are finished running the vehicle and are going to leave it alone again disconnect one of the battery terminals so there is no draw on it.
Was it running before the old battery went south? Did you have a check engine light before you replace the battery?
If you use stuff powered by electricity, you are very likely to eventually have to understand a bit about it. It'll tell you what can be plugged into a regular outlet w/o blowing a fuse. What can be run off a certain extension cord. How long you can run something off the battery in the R/V Before the battery goes flat. Things like that.
No.
My advice is to charge the battery with a battery charger before starting the engine. You will be putting a heavy load on the alternator if you allow it to charge a dead battery. This could damage the alternator.
The life of the battery. You never have to change it.
If it worked before, then possibly battery is flat.