I believe it ups the line pressure a touch too. I honestly didn't notice the difference aside the change to OD speed until I put the blower on, lol. Power is not the right word for this button.
Does it do nothing or does it just not do what you expect ?
Like the guys have said it's really just a 'shift gear differently' button. Changes earlier, holds longer. You should be able to notice the difference if you're paying attention.
It does nothing (not the only one to try it) and no light comes on. But the light for an open door doesn't come on either. So I expect I need to get some new fuses.
I don't even have a power switch. I have a vq shifter plate and it has no provision for one lol. There's absolutely no reason to use it anyway unless you're hell bent on using more fuel