I have 1996 s10 ,i have replaced the battery twice thought it was the amp,disconnected the battery with truck running and stays on so i know it something else,any ideas would help. i checked the mirror on the visor good

 

If there is a batterydrain, with everything turned off. Then pull the fuses, one at a time, see if you can kill the drain. At least then, you would know what circuit the drain is on.