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Cyrix-ct as a voltage sensing relay without second battery

Hello,

I have Cyrix-ct connected to car's battery and turning on the 12V fridge's pin 13 in the tow socket. My goal was to power the fridge in a caravan when car engine is running.

Of course, later, I have found out that Cyrix-ct doesn't close in this case, because, apparently, it requires a voltage on the other side - and fridge is just a load.

Is there a way to make Cyrix-ct work in this case? I.e. make it close even if there's only a load on its 2nd battery terminal...

If not, maybe someone could recommend an automotive voltage sensing relay? :)

Thanks!

Cyrix Battery Combiner
2 |3000

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