Do not ground either one of those wires. Doing so will blow a fuse to say the least. If you don't know , don't do it !
Is your sidestand switch still "modified" ? Y assume you are doing this near the oill cooler ? If so undo the jumper. Are you POSITIVE you are reading 7.5v on this (orange) wire ? This power comes from the ign. switch. The light blue wire goes to Relay 3 then also powers Relay 2 to turn on the headlight. Check V at F4 and see if you have 12v. there. If those #s are 7v and 12v , the problem is in the switch or at a connector .
Let me know what you find.