Ignition wiring: Switch ON

OK, I've likely spent over 90 cumulative minutes over the last several hours trying to find a wiring diagram or illustration showing what I'm looking for. I've tried Google, Google image, OTT, TBN, and the Kubota WSM site. I hate asking here what surely has been covered, but I'm apparently unable to find it anywhere so here goes:

I'm trying to install a dash mounted voltmeter to my B2650 HST ROPS. My intention is to rig it up directly to battery via a relay triggered by the ignition-on switch position. I've disconnected the ignition plug from the ignition and stared at it over several drinks. I have identified the 12v+ port (1 of 4) and have my suspicions on which one I need to tap, but cannot verify. 2 red wires, one 12v, the other 0v, 1 red w/white stripe, one orange - the latter 2 reading a low voltage at disconnect.

Before I resort to stripping random wires mid-run to test voltage, was hoping someone might be able to tell me which one is powered by ignition-ON switch.

OR... If I've drank my way over an obvious alternate solution... I'd love to hear that, as well.

This is my first full day off being able to work on this thing I've had, probably since I got it. I've never enjoyed wasting a day so much. (And no, I haven't been working on THIS particular project all day, I actually managed to complete a couple other related tasks prior to this!)

Thanks in advance!

For future reference to others:

B2650 HST ROPS Ignition:

The red wire (0v unplugged) adjacent to the 12v supply line is, in fact, hot when keyed on (12v). I tapped into it for my dash mounted voltmeter. Works perfectly so far!