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I would look at the TM's and verify what wire you want to splice into for the accessory on/off control with a power meter. The low current needed shouldn't mess with anything, but at least it has a fuse so that's good.
I'd just wire it up like an amplifier, or at least how they used too in most...
Also, I always measure things in amps on my MV. I don't care what the wattage is, amps is what everything is measured by down to the wire. Keep in mind, like the table above, if you do the equation correctly, so a light that draws 5 amps at 12v will only draw 2.5 amps at 24v. You could go by...
My only suggestion would be to run a fused power lead to a battery cutoff switch before wiring to any fuse block, relays, or switch panel. Be easier to do this as well vs tapping into a lead on the accessory switch and imo, a safer route in case there was a short or power surge, and further...