My 2003 gmc envoy lights flickered an locks flickered after i replaced the alternator and belt then the idle was off it all started with a battery not charging on dash board could i need a new battery or need a new electrical replacemen

What is your question?

I replaced the alternator thinking it wasnt pulling enough power then after i started it up and lights started flickering an locks started flickering also the idle was off i then replaced the timing belt and that didnt do much difference all i want to know is should i buy a new battery so it will get back to normal before all this was put in my dashboard said battery not getting enough charge what can i do to fix this 2003 gmc envoy so my seat dont heat up on its own an my window works again i cant figure it out

What makes this problem better or worse?

Its worse anytime i start it it idles bad now

How long has your 2003 GMC Envoy had this problem?

Its seems like its been sitting for a year