check the fuses with the battery positive disconected . then rig test light between the term and the batt. the test light will light up if there is an amp draw like interor lights and such
ither turn interor light off or pull interor light fuse
with all acc off key out of ign
absoutly nothing on
test light should light up when you first touch it to the batt and should slowlly dimm
this is the ecm and radio going to power save
if the light stays bright then pull fuses untill light goes out. when it dose you have found your short get a wirring diagram for that fuse
light may never go completlly out but it should get noticablly dimmer