Nmea 2k bus routing

[stwendl]

On a r27. 15/16 vintage does anyone know how the nmea2k bus wire is routed. I see the cables go into various device but have failed to see the end terminators which have to be there somewhere. Trying to add something and really don't want to trace all the wiring

Thanks for any input

 

[philbert]

Hello,on my 2016 25sc the T connectors for nmea are behind the refrigerator,which has to be removed.hope this helps,what are you adding?

 

[stwendl]

Hello,on my 2016 25sc the T connectors for nmea are behind the refrigerator,which has to be removed.hope this helps,what are you adding?

Installing some gadget that allows to interface to the bus with an Ethernet interface just as curiosity. The nmea2k bus is terminated on both ends and uses t connectors in between to add devices. Any additional devices need to be added the same way ( if one can find the top level bus wire)

The info I am seeking is how all of the current n2k wires are routed thru out the boat

 

[BB marine]

I just went thru a wire tracing project on my 2016 26 Cutwater. I lost power to my NMEA 2000 back bone.This stopped all communication between attached electronics and auto pilot would not turn on. I talked with Garmin and they kept telling me my power cord is bad . It is yellow. I never found a power cord after tracing every NMEA cord attached to the back bone. I then learned Cutwater/Ranger uses the Fusion radio to power up the NMEA. My radio worked, but needed to be reset ( Hold the power button down for 10+ seconds until you see it reset. Then I had to go into settings and turn the NRX power on. This powers the back bone. I called Garmin about this . They do not recommend powering the NMEA this way. Garmin states this power supply ( NRX ) is a power supply for additional remotes to operate the fusion radio from other locations in the boat. The power supply was not intended to power up the N2K. I added a Tee and a yellow Power cord to the back bone. There is a fuse location in the panel for the N2K. I ran the yellow power cord from that location. It is now powered up to Garmin standards. Works fine and my system is not reliant on the Fusion radio. I don't think all Ranger / Cutwaters are wired this way. The fusion radio models 750 have the NRX feature. If you have this feature (NRX in settings ) and run a N2K power cord to power the back bone or if your boat came with a properly wired back bone ( powered at breaker or fuse panel ) never turn the NRX setting on it will put a redundant 12v feed into the back bone and cause problems. 3 weeks ago the only thing I knew about N2K is it links the electronics together to communicate . Now after tracing every cable in the boat pulling several panels off to gain access , calling the dealer, Garmin, and Cutwater. I found the root cause and have a better understanding of the installation , troubleshooting and capabilities of N2K.
Brian Brown
26 Cutwater
PORT-A-GEE

 

[snydzy]

The nmea drop/ backbone cables are routed out the helm on the starboard side to a location behind the refrigerator. The drop cables coming from the devises located on the mast and top side are routed down the wood chase to same location.
On my 25se, the nmea is powered thru a breaker on the 12v side. The last time I accessed the backbone, I attached a backbone cable (4M) and extended the backbone into the port compartment along with the fusion radio. Now I can add t-connectors and terminator connections without removing the refrigerator every time...

 

[Andrew Custis]

Hello Steve,

Everyone is correct in telling you that the N2K buss is located behind the refrigerator. Remove the refrigerator with four screws and you will see everything mounted to a board that is easy to get to and add if you need.

Thank you,

 

[stwendl]

Thank you very much Andrew, much appreciated. So if the main bus is behind the fridge, then one could look at it as a star distribution. Good to know.