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According to my handbook its F18 engine bay for Audio Amp and inside fuse 9 For Nav/Radio (RNSE)

Further developments. Had tester placed on battery and something still drawing current. Removed RNSE and now no drain. Not sure why this was happening as I had pulled the fuse on the RNSE?!?! I turns out that I have also damaged the original battery as I have drained it so much. New battery in...

Ill need to get VCDS out and have a re-check of my coding.

On further investigation I have also found that my RNSE is also drawing about 1.4A when car if off and unit powered down. This is, as you said, why my amp was still drawing 0.8A. Not sure where to start now as id imagine the unit is for the bin :(

I have been having issues with battery drain recently and seem to have narrowed it down to Fuse F18 (Audio Amplifier) I do noticed that I still get a hiss from the speakers even when the car is turned off. Removing this fuse also removes the hiss. I am wondering if this hiss is normal with BOSE...