2006 ram 1500 . cargo light stays on. Have to disconnect battery. When reconnecting battery the cargo light comes back on. Also the interior lights and the insturment panel lights stop working after five minutes or less. The odometer stays lit. The radio stays lit.everything else goes out.before this all happened I did get a whiff of what smelled like a burnt cut off wheel...I know something got toasted... I just hope someone can get me going in the right direction. I don't have any meters or testers so this is going to be trial and error for me. Any suggestions will be appreciated.