I know this may be a no brainier for some, but how long can you leave the negative post off while installing audio? Does it mess with the ECM in a bad way?? I will probably take a few days no more to complete my install where i can connect my battery back to the bike. Is just pulling the negative post off for audio install enough or are there other things to unplug??? I have heard the fuse on the side of the bike has to come out too if unplugged too long??? What's the right and wrong way to start this install?