Resolved!
I had connected + & - the wrong way round.
For reference:
1 = negative
2 = 5volts
3 = 12v live
So what I had previously read up on here stating 1 & 3 the opposite way round is incorrect
So I thought I had found the right plug to connect an additional sat nav to (under tank cover on left) it reads 12v with ignition on but won?t power the sat nav.
Am thinking there?s a canbus that doesn?t like it.
Any ideas?