48 DA Owners Club

Shaps said:
Hi @ttmott
Just confirmed. I have no LEDs active on my NIM when the generator is running
Click to expand...
I would check to make sure it is getting power and run signal from the generator. With the generator ign switch on measure voltage across pins 1 (ground) and 4 (+12V) on the J10/P10 NIM connector (the connector on the right side of the NIM card). This is the battery power to the NIM
Then check the Generator Run (NIM wake up) signal to the NIM which is 12 Volts between pin 1 (ground) and pin 6 (Run signal).
If you have voltage at these two locations and the connector is well seated then I would venture to say there is an issue with the NIM.

Also on some Smartcraft installations the Pin 6 got it's run (wake up) signal from the Smartcraft network. So, if you see that wire at Pin 6 cut from the "Y" adapter harness that connects to the NIM from the generator then you need to reconnect it back into the harness. Here is a schematic showing what I'm talking about (note the dashed line at pin 6 and the Note 10.
Presentation1.jpg
 
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ttmott said:
I would check to make sure it is getting power and run signal from the generator. With the generator ign switch on measure voltage across pins 1 (ground) and 4 (+12V) on the J10/P10 NIM connector (the connector on the right side of the NIM card). This is the battery power to the NIM
Then check the Generator Run (NIM wake up) signal to the NIM which is 12 Volts between pin 1 (ground) and pin 6 (Run signal).
If you have voltage at these two locations and the connector is well seated then I would venture to say there is an issue with the NIM.

Also on some Smartcraft installations the Pin 6 got it's run (wake up) signal from the Smartcraft network. So, if you see that wire at Pin 6 cut from the "Y" adapter harness that connects to the NIM from the generator then you need to reconnect it back into the harness. Here is a schematic showing what I'm talking about (note the dashed line at pin 6 and the Note 10.
View attachment 103018
Click to expand...
With ignition on, not running but woken up, I have 13.4v at 1 and 4, nothing at 1 and 6 unless it is running, then 13.4v
 
Shaps said:
With ignition on, not running but woken up, I have 13.4v at 1 and 4, nothing at 1 and 6 unless it is running, then 13.4v
Click to expand...
And no LED's are showing - I'd say there is an issue with the NIM. It should have woke up and started talking to the generator shown by LED DS2 blinking fast.

then when It's talking to the J1939 network DS4 will blink slowly.

As an edit - the four LED's, if I remember correctly, are located along the left edge of the NIM card as it is installed in the generator.
 
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ttmott said:
And no LED's are showing - I'd say there is an issue with the NIM. It should have woke up and started talking to the generator shown by LED DS2 blinking fast.

then when It's talking to the J1939 network DS4 will blink slowly.

As an edit - the four LED's, if I remember correctly, are located along the left edge of the NIM card as it is installed in the generator.
Click to expand...
Thanks Tom. I think you are correct regarding LED location on the NIM. Mine were not lit at all. New NIM board will be here Friday, for Saturday install. Fingers crossed. Thank you for walking me through the diagnostics.
 
Shaps said:
Thanks Tom. I think you are correct regarding LED location on the NIM. Mine were not lit at all. New NIM board will be here Friday, for Saturday install. Fingers crossed. Thank you for walking me through the diagnostics.
Click to expand...
What do you think is the root cause for the NIM failure? It's a rather large investment not to know and put the replacement at risk....
 
Really difficult to say. When I got the boat, it already has a vv7 and no gem info anywhere.
I never thought to check the NIM was working nor did my surveyor. It was a smartcraft device and I made the assumption that I'd I followed steps done here it would have worked seamlessly. The generator itself runs flawlessly.
Any thoughts?
I hear you, I would hate to plug in the new NIM and have it fail.
 
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Shaps said:
Really difficult to say. When I got the boat, it already has a vv7 and no gem info anywhere.
I never thought to check the NIM was working nor did my surveyor. It was a smartcraft device and I made the assumption that I'd I followed steps done here it would have worked seamlessly. The generator itself runs flawlessly.
Any thoughts?
I hear you, I would hate to plug in the new NIM and have it fail.
Click to expand...
About the only thing that can fail the NIM is a large voltage surge like someone disconnecting the battery when the generator was running and the charging alternator going high order; but that would have probably also taken out the generator controller as well as the alternator..... Who knows. It seems to me the only thing you can do is go over all of the wiring one more time especially that Y adapter between the generator, remote starting switches, and the NIM. Changing to the VV7 wouldn't do anything negative to the NIM.
 
ttmott said:
About the only thing that can fail the NIM is a large voltage surge like someone disconnecting the battery when the generator was running and the charging alternator going high order; but that would have probably also taken out the generator controller as well as the alternator..... Who knows. It seems to me the only thing you can do is go over all of the wiring one more time especially that Y adapter between the generator, remote starting switches, and the NIM. Changing to the VV7 wouldn't do anything negative to the NIM.
Click to expand...

Agreed on the VV7. I mentioned that only because when the PO did that, he removed any genset information at the helm and never looked back.

One other oddity to add, I also purchased a cummins remote to mount at the helm, along with the associated Y harness and wiring.
cummins-onan-remote-mounted-digital-control-0541-1130.jpg
Plugged that into the NIM, it woke the genset as it was supposed to, started it, had all relevant information on it, but curiously would not shut the generator off when we help down the stop button.
 
Shaps said:
Agreed on the VV7. I mentioned that only because when the PO did that, he removed any genset information at the helm and never looked back.

One other oddity to add, I also purchased a cummins remote to mount at the helm, along with the associated Y harness and wiring.
View attachment 103042
Plugged that into the NIM, it woke the genset as it was supposed to, started it, had all relevant information on it, but curiously would not shut the generator off when we help down the stop button.
Click to expand...
I'm trying to remember but I thought there was a modification to the generator's wiring harness if that remote was to be used in conjunction with the NIM..... Was that unit disconnected when all of the NIM testing was being done?
If the RS485 serial data stream from the generator's controller was corrupted the NIM wouldn't function at all. That data is provided on pins 7 and 8.

EDIT -
Oh yea here it is; note on the drawings -
If the set is equipped with the NIM and the E-series display. Connect display plug P33 into engine harness J4. And display plug J34 into accessory harness plug P43.
 
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ttmott said:
I'm trying to remember but I thought there was a modification to the generator's wiring harness if that remote was to be used in conjunction with the NIM..... Was that unit disconnected when all of the NIM testing was being done?
If the RS485 serial data stream from the generator's controller was corrupted the NIM wouldn't function at all. That data is provided on pins 7 and 8.

EDIT -
Oh yea here it is; note on the drawings -
If the set is equipped with the NIM and the E-series display. Connect display plug P33 into engine harness J4. And display plug J34 into accessory harness plug P43.
Click to expand...

That unit was tested independently and NOT part of the other NIM tests.

Any chance you can email me that picture of the display, its blurry when I zoom it up here. THANK YOU!

As an aside, Im jealous, @ocgrant just plugs it in and it all works... Me??? no such luck. Ha
 
Shaps said:
That unit was tested independently and NOT part of the other NIM tests.

Any chance you can email me that picture of the display, its blurry when I zoom it up here. THANK YOU!

As an aside, Im jealous, @ocgrant just plugs it in and it all works... Me??? no such luck. Ha
Click to expand...
Sure Message me your email.
 
Where did you plug in the "Y" harness?
upload_2021-4-14_7-38-58.png

upload_2021-4-14_7-45-59.png
 
Shaps said:
Ah. I plugged that harness into the NIM.

I'll look outside the generator for a place to insert that.

@ocgrant, why does it appear you have 2 cables coming out of your J12 connector? One I assume is the maretron cable (the gray cable)
Click to expand...
That is the harness to the gauge option which would have been located with the fuel valves. It has nothing to do with the NIM or the Y harness. If you don't have the gauges that harness dead ends where the fuel valves are located. Here is a pic -
Generator Elect Harness.jpg
 
Shaps said:
Ah. I plugged that harness into the NIM.

I'll look outside the generator for a place to insert that.

@ocgrant, why does it appear you have 2 cables coming out of your J12 connector? One I assume is the maretron cable (the gray cable)
Click to expand...
That could be your issue... You interupted the engine harness going into the NIM, the y harness needs to go after the split in the engine harness on the outside. Only one harness going into the J1939 connecter, that other is just in the way on the photo
 

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ocgrant said:
That could be your issue... You interupted the engine harness going into the NIM, the y harness needs to go after the split in the engine harness on the outside. Only one harness going into the J1939 connecter, that other is just in the way on the photo
Click to expand...

I ONLY inserted that T-Connector to test the remote panel. All other attempts/tests were done with just the original plug/harness into the J10 on the NIM.

Edit:
Do you think that may have damaged the NIM?
Ugh, hope not.
 
Right there is where that Y harness goes... That harness goes to your panel where your current controls are. You can either leave that alone and "daisey-chain it" off the panel controls or insert the "Y" harness at that plug and use a cable like I did to run the remote to your helm.
upload_2021-4-14_8-24-25.png
 
ocgrant said:
Right there is where that Y harness goes... That harness goes to your panel where your current controls are. You can either leave that alone and "daisey-chain it" off the panel controls or insert the "Y" harness at that plug and use a cable like I did to run the remote to your helm.
View attachment 103050
Click to expand...

Understood. Will add that to the testing...
Thanks Grant
 
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