Connect black lead from the voltmeter to battery ground, red probe to the fuse on the red/blue wire, switch on ignition and move right handlebar switch to the "PO" position - should read battery voltage on both sides of the fuse
Now move the red probe to the fuse on the blue/yellow wire and move the switch to the "ON" position - should now have battery voltage on both sides of both fuses
let me know how you get on
Edit: DISREGARD THE ABOVE, I HAVE JUST LOOKED AT A BETTER VERSION OF THE DIAGRAM. WILL POST INSTRUCTIONS LATER TODAY