99 2.5L ford ranger cranking no spark

[deere_construction]

just got the truck had it for a day it ran great for a day no troubles when it started i could tell the battery was going bad cause when it would crank the lights would dim a ton and u could hear the starter strugling. I was going to see how long it would last though. Then i was doing an errand and looked at the dash and the door ajar was on and the dome light was on both doors were shut tight so i figured i just unplug the fuse to that and mess with the switch later cuase i couldnt find it. i pulled the fuse and went to start and the battery was toasted by then so replaced it and when i went to go crank it over it wouldnt start. I checked for spark no spark so hooked up code reader and that wouldnt connect either so i though mmay the fuse i pulled was connected to some alarm so i it back in still wouldnt start and still no spark. I been reading other forums on here say that its the ecm or pcm but i was wondering wht ur thought were or wht i could test to be sure.

If im not getting power to the coil packs wht else could it be......relays are good so are fuses.