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Sonoff 4CH Pro using 12v DC not working

Hi folks, 

I have a couple Sonoff 4CH Pro which I have connected up to my wifi and whilst I can use it to operate devices at 240v AC successfully if I change over to using 12v DC and 12v DC devices (LED lights)  it doesn't work. 


It will start up, connect to wifi and by using the EWeLink software I can get the channel indicators come on and off along with a relay click, however, there is no power out to the 12v device that is connected.

I have used 2 separate units and get the same result with both so I was wondering if anyone has got a 4CH Pro working 12v DC lights from a 12v DC power supply?


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