The converter kit includes a sender unit, a receiver unit, and a DC power adapter which connects to the receiver?
Is the DC power adapter in fact connected and supplying power to the receiver? If not, try using the DC power adapter.
If the DC power adapter is in-use, maybe your source is able to provide electrical power to the sender, whereas your switch is not. Maybe try a different converter (extender) which powers the sender (transmitter) and works with a higher voltage for DC power?
Just a guess...