Rcently did some maintanence on the battery in a 92 dakota LE. Radio lost its settings, and I do not have the audio manual which explains how to set the clock and the whatnot. I've also lost all audio on the radio (however the clock is visible) and Im not sure wat happened since this was working before the battery maintanence

 

I would think maybe a fuse or maybe you forgot to connect a wire on the bat.