Power Windows & Radio

Hey guys i recently did an engine swap on my mustang and everything was working fine except for power windows and radio. I've replaced the accessory delay fuse and it did not fix the issue. Everything was working fine before the engine swap so im stumped. The odd thing is it cuts on after the car has been on for about 20 mins and works perfectly fine. Any pointers as to what the issue could be will be greatly appreciated. Thanks