It should have worked connected like the first 2 ways you did it. The last way obviously wouldn't switch since it's connected to power all of the time.
Maybe you're using a relay thats too big.
Can you try it directly to your amp? Just put the RMT wire on the Remote connection of your amp. Should work also without the need of the GND wire.
Try measuring the RMT for 12V there when the M2 is powered on. If you don't get 12V there probably is something wrong with your PSU.



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anyway i have tried:
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