Maretron DSM410 / J2K100 / J1939 Onan programming

@Jeremygavin
You will need to convert your smartcraft NIM to the J1939 version which involves the jumpers mentioned above.
Repairing jumper W5 and cut W2. (In my particular install, I wound up having a bad NIM and bought a J1939 NIM, but others here have done this conversion successfully)

Put the board back in, connected the Maretron J2k100 to the deutsch 12 pin connector via maretrons cable.

I then put the J2k100 onto the NMEA2k network that I had a drop cable to in my Engine Room and back to the helm.
As long as your N2k network has a terminator at each end, I'm pretty confident this will work for you too.
Thank you for the info. That is very helpful.
 
You do not need to repair W5 if the OEM harness is still there. Don't mess with that. Only cut W2 to convert the NIM from Smartcraft to SAE J1939.
In @Jeremygavin situation he had the data and all of the infrastructure is in place including the resistors.
He can simply connect the J2K100 at the J-Box in the helm or overhead where the end CAN 3 resistor is. As a note that end resistor may be a combined CAN 1,2, and 3; you need to look at.
You are looking for trouble and complications by attempting to repair that W5.
Thanks for the clarification. When I get down to the boat I will check it out.
 
Grant, I have removed the NIM and readied the wires. The existing jumpers show AWM 125C 600V wire ratings. Did you use this kind of wire or simply an AWG wire? If AWG, what gauge did you use? I guess AWM (appliance wire material) has some heat ratings to it. Thanks.
 
I just g
Grant, I have removed the NIM and readied the wires. The existing jumpers show AWM 125C 600V wire ratings. Did you use this kind of wire or simply an AWG wire? If AWG, what gauge did you use? I guess AWM (appliance wire material) has some heat ratings to it. Thanks.
I just grabbed a piece of 18 gauge marine tinned wire and used it.
 
After reading all the post twice I am try to figure out if there is a way to test the Maretron J2k100.
When I just purchased my boat ( 2015 410 ) all generator info is not showing up on the Vessel View, After digging into this I am assuming it worked at one time as the Maretron J2K100 is installed on the generator and the jumper wire W2 is cut on the Nim board and there is a wire that goes to the N2K under the helm
I just purchased the 300-6393, I am going to put this on the generator but would still like to see the data on my VV
Is there a way to test the Nim board for data out put.
Is there any way to test the Maretron J2K100 for data.
Is there any programming in the Vessel View I can check to see if is set right.
 
Last edited:
After reading all the post twice I am try to figure out if there is a way to test the Maretron J2k100.
When I just purchased my boat ( 2015 410 ) all generator info is not showing up on the Vessel View, After digging into this I am assuming it worked at one time as the Maretron J2K100 is installed on the generator and the jumper wire W2 is cut on the Nim board and there is a wire that goes to the N2K under the helm
I just purchased the 300-6393, I am going to put this on the generator but would still like to see the data on my VV
Is there a way to test the Nim board for data out put.
Is there any way to test the Maretron J2K100 for data.
Is there any programming in the Vessel View I can check to see if is set right.
I think the easiest way to check is on your Vessel View. Not sure what model you have but on the VV4, Settings...Network...Device List should reveal whether your Vessel View can see the J2K100, which should show up as one of the devices. If it's there, select it and there will be a page that enables a limited set of configuration options. The "Configuration" button will allow you to set an instance number; you should be able to ignore that. Under that is a drop-down button entitled "Is Generator". If that is there you will want to select "Yes" and save. There also will be a "Data" button; selecting that will show all the data fields being reported. I think you will need to have the generator on and running to run the check. The data should be coming over your N2K network so that will need to be on and operating as well.
 
Additionally
There are LEDs along one side of your NIM.
They will tell you the status of the NIM. If I recall, there are 4 LEDs and if you can't find the manual online I will try to find the info when I get a chance.
 
PXL_20211010_223124226.jpg
 
I got to the boat and this is what I found.
I have Vessel View 4
There is only one LED light on the Nim and it was lit up.
The J2K100 is not in the device list
I did hook up the 300-6393 control board to the Nim plugs an it show all data and all functions worked as it should.
Alnav do you know how to add the J2K100 to the device list, or does it just so up there when it is detected.
Maybe a bad Maretron gateway ?
 

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First - do you know if the J2K100 has been programmed?
Does the J2K100 have power? it is powered through the NMEA2000 network.
Is DS2 flashing? If so we know the NIM is communicating with the generator.
It looks as if DS4 isn't illuminated at all so it is not talking to the J2K100.
So first thing is to check for power to the Maretron unit and then verify it is correctly programmed.
 
ttmott I am not to familiar with this system ( J2K100 ) Can you explain a little in detail.
Power is though the NMEA200
What is the DS2 , DS4
How do I test for power at the J2K100 ?
How do I program the J2K100 ?
I assume the J2K100 has been programmed because when I started looking into this I found
All wires ran, W2 jumper cut on NIM, and J2K100 installed
It all looks like it was factory installed
 
ttmott I am not to familiar with this system ( J2K100 ) Can you explain a little in detail.
Power is though the NMEA200
What is the DS2 , DS4
How do I test for power at the J2K100 ?
How do I program the J2K100 ?
I assume the J2K100 has been programmed because when I started looking into this I found
All wires ran, W2 jumper cut on NIM, and J2K100 installed
It all looks like it was factory installed
 
ttmott I am not to familiar with this system ( J2K100 ) Can you explain a little in detail.
Power is though the NMEA200
What is the DS2 , DS4
How do I test for power at the J2K100 ?
How do I program the J2K100 ?
I assume the J2K100 has been programmed because when I started looking into this I found
All wires ran, W2 jumper cut on NIM, and J2K100 installed
It all looks like it was factory installed

When Mercury discontinued supporting CAN V (post Diesel View around 2006) they still had ONAN install the NIM plus optioned with the Maretron J2K100 SAE J1939 to NMEA 2000 converter. Maretron created a "kit" which had the J2K100 preprogrammed for the Onan/NIM and that was interfaced with the later Vessel View NMEA 2000 interface. Boat owners that did not have that Maretron option could purchase the same pre-programmed kit and do the installation themselves. There is much more to the installation than simply plug and play however.
NMEA2000 - It seems your boat has a Raymarine NG network which is essentially the same as NMEA 2000 except for their propriety connectors and cabling. Regardless the data protocol is the same. Both networks require power; 12VDC, and it is that power that powers many of the connected instruments like GPS and all Maretron equipment. It is that network power that provides power to the J2K100 converter.
The DS2 and DS4 are the lamps on the NIM card; it is printed on the card adjacent to the lamps.
Testing for power on the J2K100 and programming is done through a Maretron display such as a DSM410 or through the Maretron N2KView software.
W2 being cut converts the NIM from Smartcraft data protocol to SAE J1939 data protocol which the J2K100 needs to communicate.
 
Ok I am getting a much better understanding of what is going on now, goes back to Shaps post # 69
Will try to trace out the wiring I guess.
 
@Spark600
In my case, I actually had a bad NIM and wound up buying a NMEA 2k NIM card (the original being Smartcraft).
None of my LEDs were illuminated on the original NIM.
It's in one of the threads here, let me know if you can't find it.
 
ttmott I am not to familiar with this system ( J2K100 ) Can you explain a little in detail.
Power is though the NMEA200
What is the DS2 , DS4
How do I test for power at the J2K100 ?
How do I program the J2K100 ?
I assume the J2K100 has been programmed because when I started looking into this I found
All wires ran, W2 jumper cut on NIM, and J2K100 installed
It all looks like it was factory installed
Spark, to answer one of your earlier questions, I think the J2K100 would show up on N2K without any need to configure if it were properly connected including power. But, it might not be showing any data depending on its connection to the NIM and if there were a programming issue. Since your NIM seems to be feeding the Onan display and the Maretron converter is not showing up on the network, I think the odds favor your having a problem with the J2K100. I would first check all the N2K connectors from the J2K100 to the backbone by opening each up and re-seating. You could also check for power at the J2K100 connector. Here are the Maretron pinouts on the N2K side:



upload_2021-10-13_10-48-47.png

If you happen to have an N2K device you could easily swap for the Maretron, that would be a good way to check whether there is a network problem at the attachment point which I assume is in your ER?
 
Spark, to answer one of your earlier questions, I think the J2K100 would show up on N2K without any need to configure if it were properly connected including power. But, it might not be showing any data depending on its connection to the NIM and if there were a programming issue. Since your NIM seems to be feeding the Onan display and the Maretron converter is not showing up on the network, I think the odds favor your having a problem with the J2K100. I would first check all the N2K connectors from the J2K100 to the backbone by opening each up and re-seating. You could also check for power at the J2K100 connector. Here are the Maretron pinouts on the N2K side:



View attachment 113716
If you happen to have an N2K device you could easily swap for the Maretron, that would be a good way to check whether there is a network problem at the attachment point which I assume is in your ER?
I think you will find the NIM does not interface with the Onan external instrumentation. That instrumentation works right off the generator's data feed. Take a close look at the wire harness from the generator to the NIM; It is an adapter harness that taps off to both the NIM and the Onan external instrumentation.
 

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