Should I have Voltage reading between EMC to T200 if not connected to T200?

I have a T200 on a kayak. It worked well for many days on the water but quit working one day. I found the white wire out of the EMC to the T200 burnt as well as a step up converter (from 12v to 18v)not working. I replaced the converter and BR basic EMC. Now I have no voltage out of the EMC. Thruster Commander led’s are increasing and decreasing with potentiometer but no voltage out of EMC whether connected to T200 or not. T200 works with a separate power source. How can I test to see if the Thruster Commander may be the problem or if the new BR basic EMC is not working?