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Hello, my name is***** will assist you
How is it that I may assist you with the unit?
Hello David. Yes I am in the USA, in the Central time zone.
In order for you to get to the connections on the back of the unit, you are going to need to get behind it. This chartploter may have not been installed at the plant where the boat was made, so there has to be an access somehow. If you have a large gauge cluster that is on a screwed in panel, that may need to come out. The RL70 will be bolted in from the rear of it, not the front. Can you try and upload a pic here of the installation, perhaps I will see something to gain you access.
Corrosion is a very likely possibility on a unit that is exposed to the elements. You will also want to check the connections on the back of he salon unit as well.
You can email your pics to***@******.***. Tell them that you are working with me on this question, and they will forward them to me.