Replaced an RDP139 with RDP149 but Sounder is not working

[Mereman]

Any help will be much appreciated.

 

[TheReaper]

What model sounder (fish finder) do you have?

 

[Sparky Wire]

@TheReaper is right, to really help, the model number is needed. It would also be interesting to know if the sounder is working on one just one of them (RDP149/RDP139) or both of them it doesn't work. More details are needed.