Had a bad jump start that fried a few things a few months ago. Replaced battery and alternator, so those are both new, and replaced the 100 amp mega fuse and A/C relays. The truck started and ran for several weeks, but then one day turned the key and it did absolutely nothing...also, absolutely NO lights on the dash display except for the check engine light. Had a friend test with scanner and it can't link with computer. Got a new programmed PCM, installed it, and same problem. I think it's a relay, but no idea which one.
Also, we've noticed that now the brand new battery goes dead quickly, like, in about 3 weeks. I just think that's awfully quick for a new battery to go totally dead. It's as if something is stuck ON and draining it. Any help would be greatly appreciated!

Mechanic changed oil in my truck and afterwards an engine light was triggered that said 200amp blown alternator fuse. Mechanic tried to order and it is on back order with unknown eta. So now what can I do?

I put a new battery in my truck and it runs the battery dead my alternator is not charging my battery but I put a new alternator in