Depends on whether you want to risk blowing fuses and feeling what 12V is like through your hands mate.
12 V through your hands won't feel like anything.
With the ignition off there is only one live 12v wire in the stereo harness (the permanent 12v connection).
If all you are doing is plugging in a new harness there is no need to unplug the battery.
If you are doing cutting / soldering etc inside the dash on the harness, then you might want to take the fuse out. If the 12V line touches something else or the ground plane you could possibly do some damage or blow a fuse.
Just a question for everyone who wouldn't disconnect the battery, can I ask why?
Just a question for everyone who wouldn't disconnect the battery, can I ask why?
1)
have NFI what soldering has to do with having the battery connected or not. its not like welding.
i do this for a job. and ive never disconnected the battery for a stereo install . you shoudnt have a problem with leaving it all live