I would like to use sat-nav on my 1199 tric but not drain the battery when i turn off the ignition, does anyone know where I should cut into the wiring loom to do this, It would also be where you would attach heated grips I suppose.
Take a battery tender jump lead, hook it up to the battery, and take another tender jump lead, cut the terminals off the ends and hook in a disconnect of your choice (I'd put in a fuse too) and extend the wires out to tap into whatever type of outlet you need.
Bingo bango.
For the heated grips, I'd hook it into the horn's leads assuming the fuse it uses will support the draw. Just don't use the horn when the grips are on