Driving to a meeting last night I turned left and although my blinker was on, it made no sound. I cut the truck off, went to a two hour meeting and came out to a truck that would not start as the battery seemed to be dead. I grabbed the battery cables to see if they were tight ( they were ) and when I tried it again it cranked right up, but the dash lights are not working, and I noticed the ac was not working although the light on the handle was lit up for it. Any advice on how to proceed? Thanks in advance.