head unit resets everytime i start it

Hey all I am kind of a newbie to this but maybe someone will be able to help me. I have an '89 Honda Accord LXi and i took it in to a mechanic because it wouldn't start. (I even tested the battery before i took it in and it seemed fine). But the mechanic put in a new battery and all was fine. The promblem now is that whenever i start my car the stereo radio presets and clock and everything are all reset. I can change them again but after I shut my car off and start it again they go back to factory settings.

Any suggestions for this problem would be appreciated. By the way I was looking around underneath the head unit and i saw the end of a power cord so i followed it through the firewall it ended right next to the battery. Could there have been a cord on the + side of the battery going to my head unit that the mechanic didn't think i needed?

Thanks
Adamg

The 12V constant on the radio is not hooked up, or
the 12V constant has a fuse and is blown.
This is usually a red wire ran to the igntion switch. Theres 2 12V outputs out of the igntion switch, a switched one and the constant.

hey thanks. How should i go about fixing this. I can see one end of the red wire underneath the middle console, and the other end of the wire right next to the battery. What do i need to do to fix it?
Thanks
adamg

Make sure that the red wire is hooked up to the ignition switch(red wire) or the batt. It its beter to hook it up to the ignition tho.

hey thanks for the idea, im pretty sure it'll work i havent tried it yet though, thanks adam