I need some help because I’m lost. I have a 03 Chevy 1500hd and all my problems started when my alternator quit. I replaced it then a few weeks later my radio shut off and my ABS light and brake light would come on. I found if I shut my blower motor off then it fixed everything so I put a new blower motor in and also a blower motor regulator. Every time I turn the blower on the radio would shut off so I started chasing wires and bumped my 4x4 button and it would do the same as turning the blower on. I started cleaning grounds checking the battery voltage which is 12.4 and pulled the fuse box under the hood to check for any bad wires. Now the blower won’t work on anything but high. With it on high the radio will work but any other speed the radio shuts off and the ABS and brake light comes on. If I push the 4x4 button the radio shuts off and service 4x4 comes on. Please any help or advice is greatly appreciated.