I specifically didn't show how I tapped into the psu as I didn't want others who maybe shouldn't be tinkering in there in the first place using this as a 'guide' which it is not. I myself am very comfortable with what I did and where I tapped both the 120v & 12v. The 120 came right off the main leads of the macs power cord, just inside the psu. The 12v will be very obvious to anyone who has any business in there. So the aux psu is not "drawing" anything from the main psu except the the 12v to trigger it on or off. Same as if it was plugged into a sata power connector as intended. =)
There is no relay work involved. The 12v from the psu triggers the aux psu to turn on of off. The circuitry is already in the aux psu for that.
The mod was really very simple and to me beats the heck out of snaking another 120v line through your mac and out the back and across the floor....
Plus I needed to get at the 12v anyway as I didn't want to lose my precious sata connections.
P.S. There's no prying or cutting to open the psu. half dozen phillips screws and it opens up like a clam.
Okay... Here's the 120v tap. Right off the main plug connection.
🙂
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