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I would start here as JSARONSON suggests. Can you get a hold of Maretron's N2K Meter to test the physical cabling?you need to ground the power cable. put a meter on the wire going into the network to verify.

If not, if you have a DVM you should test as follows:
Maretron Support Knowledge Base :: How do I check the health of my N2K cabling before powering my network?