4-in-1 gauge and Maretron TLA100

Looked at the schematic Tom posted in #6 & #8.

To me it looks like Tank Levels are coming back into the System Integration Module and that data being sent out over CAN 2, and CAN 2 is connected in parallel with the J1939 network which would be accessible in the 9 Pin Service Tool Connection. I would think that data would be on the J1939 bus and and adding a Yacht Devices Engine Gateway YDEG-04, wwould allow that data to be accessed. Fuel Level and Tank Capacity is supported on this device. Maretrons doesnt seem to support Fuel level and Capacity.

upload_2021-12-8_9-39-55.png
 
Looked at the schematic Tom posted in #6 & #8.

To me it looks like Tank Levels are coming back into the System Integration Module and that data being sent out over CAN 2, and CAN 2 is connected in parallel with the J1939 network which would be accessible in the 9 Pin Service Tool Connection. I would think that data would be on the J1939 bus and and adding a Yacht Devices Engine Gateway YDEG-04, wwould allow that data to be accessed. Fuel Level and Tank Capacity is supported on this device. Maretrons doesnt seem to support Fuel level and Capacity.

View attachment 116568

To me it looks like that is true for post #6. But #8 definitely is separate. They get power off of the engine harness but the signal is not added. What looks to be pins 83/4 pass through to pins 38/9 of a connector then to the gauge(s). So I don't think that is being passed to the J1939 bus. Do you see something different?
 
Is this your configuration for each engine? If so then those schematics I posted are not entirely correct. This is the first gen Smartcraft (pre 2002 I think) and does not have the System Integration Module to integrate the engine and external sensors.
DCM-SmartCraft-1024x768.jpg
 
I do have a similar plate with plugs on the front bulkhead and will get some pics this weekend. Reading wiring schematics is not my strong point but I do note that the ones posted are calling out J1939. My engine protocol is J1708 so not sure if that helps with the Smartcraft determination.
 
To me it looks like that is true for post #6. But #8 definitely is separate. They get power off of the engine harness but the signal is not added. What looks to be pins 83/4 pass through to pins 38/9 of a connector then to the gauge(s). So I don't think that is being passed to the J1939 bus. Do you see something different?

To me, it looks like Can 2 is sending data out to the Main Station and paralleled on the 9 Pin Service Tool Connection.

upload_2021-12-8_10-43-5.png
 
Is this your configuration for each engine? If so then those schematics I posted are not entirely correct. This is the first gen Smartcraft (pre 2002 I think) and does not have the System Integration Module to integrate the engine and external sensors.
DCM-SmartCraft-1024x768.jpg


The Yacht Devices Engine Gateway can also be configured for SmartCraft...theoretically. Devil would be in the details, specifically if the sensors data is on a network. Looking at those gauges, I think its some kind of network supplying the data, not strait analog (as there would be more wires).
 
To me, it looks like Can 2 is sending data out to the Main Station and paralleled on the 9 Pin Service Tool Connection.

View attachment 116570

Yes, but the tank levels are separate from all that. Look at the lines a few up from what you highlighted. They are labeled Level 1, Level 2 and go over to two pin connector Tank 1, Tank 2. It looks like they are not part of the 1708/1939 network.
 
Yes, but the tank levels are separate from all that. Look at the lines a few up from what you highlighted. They are labeled Level 1, Level 2 and go over to two pin connector Tank 1, Tank 2. It looks like they are not part of the 1708/1939 network.
Yes the fuel tank wiring for this generation of Smartcraft terminate into the Motorola System Integration Module which converts these and all others to the Smartcraft data stream on the two networks.
For @quality time 's boat these diagrams are, for the most part, not applicable as he as Smartcraft Original. ie pre Diesel View. I believe the Diesel View was Smartcraft 1.0.
With that said I have suspected that the Smartcraft CAN2 and J1939 are the same; the Cummins diagram shows them interconnected. Someone would have to connect CAN 2 to a J1939 port and see if data comes through.
SAE J1708 has been phased out to J1939; regardless I don't believe his fuel tank signals are converted to SAE J1709 but rather to Original Smartcraft using that interface in the above picture.
Question @quality time - do you have C-Cruise on your boat?
 
Last edited:
Yes the fuel tank wiring for this generation of Smartcraft terminate into the Motorola System Integration Module which converts these and all others to the Smartcraft data stream on the two networks.
For @quality time 's boat these diagrams are, for the most part, not applicable as he as Smartcraft Original. ie pre Diesel View. I believe the Diesel View was Smartcraft 1.0.
With that said I have suspected that the Smartcraft CAN2 and J1939 are the same; the Cummins diagram shows them interconnected. Someone would have to connect CAN 2 to a J1939 port and see if data comes through.
SAE J1708 has been phased out to J1939; regardless I don't believe his fuel tank signals are converted to SAE J1709 but rather to Smartcraft 1.0 using that interface in the above picture.
Question @quality time - do you have C-Cruise on your boat?

I agree you would have to try.
 
Yes the fuel tank wiring for this generation of Smartcraft terminate into the Motorola System Integration Module which converts these and all others to the Smartcraft data stream on the two networks.
For @quality time 's boat these diagrams are, for the most part, not applicable as he as Smartcraft Original. ie pre Diesel View. I believe the Diesel View was Smartcraft 1.0.
With that said I have suspected that the Smartcraft CAN2 and J1939 are the same; the Cummins diagram shows them interconnected. Someone would have to connect CAN 2 to a J1939 port and see if data comes through.
SAE J1708 has been phased out to J1939; regardless I don't believe his fuel tank signals are converted to SAE J1709 but rather to Smartcraft 1.0 using that interface in the above picture.
Question @quality time - do you have C-Cruise on your boat?
So anyway you look at it, it's in the too hard bag to get his existing fuel senders on NMEA 2000 and keep his existing Smartcraft gauges functional. Maybe look into how multi-helm boats were wired so the bridge and solon helms could both have fuel gauges in the days of old..... Because this configuration would be no different - 35 to 240 ohm.
Regardless, I think it wouldn't be too hard to cut in a Maretron TLM100 next to the existing sender and use a focus tube so the existing sender assembly wouldn't interfere. That's the direction I'd go as it implements a level of redundancy which I like.
 
Yes, but the tank levels are separate from all that. Look at the lines a few up from what you highlighted. They are labeled Level 1, Level 2 and go over to two pin connector Tank 1, Tank 2. It looks like they are not part of the 1708/1939 network.

Yes, but it all seems to terminate in the system integration module...
 
I’m trying to figure out a way to get my fuel tank levels onto my NMEA network while still leaving the analog gauges in tact. The issue is that my boat has the analog 4-in-1 gauges with 4 wires going into the back of it. I was told by Maretron that it is not possible to use the TLA100 with this type of gauge.

Does anyone know how these factory gauges are wired? My thought is that the individual sending unit wires must go to a buss block where they transition to the 4 wire plug on the back of the gauge. I have tried tracing backwards from the dash but they just get lost in the bundle.

Or am I missing another option?
Lookee what I found. This may be able to be used in parallel with the gauges as it can be calibrated for any resistance range; I'd give KUS a call.
https://kus-usa.com/product/nkc42-network-converter/
https://kus-usa.com/wp-content/uploads/2020/08/NKC42-Manual.pdf
NKC-42-Version-1-1500-%C3%97-1500-100x100.jpg
 
Lookee what I found. This may be able to be used in parallel with the gauges as it can be calibrated for any resistance range; I'd give KUS a call.
https://kus-usa.com/product/nkc42-network-converter/
https://kus-usa.com/wp-content/uploads/2020/08/NKC42-Manual.pdf
NKC-42-Version-1-1500-%C3%97-1500-100x100.jpg
Thats pretty cool Tom.... And they are just around the corner from my boat. This might be an easy way to get my fresh & black water systems on my N2K network. I will have to pay them a visit after the new year.
 
I’m late to the conversation and apologize if you’ve already ruled this out but it may work as well?

https://yachtdevicesus.com/collections/nmea-converters-adapters/products/tank-level-adapter
Cool, welcome - his issue is he wants to keep the existing gauges active. The existing system puts a voltage bias on the signal and conversely the existing data system cannot accommodate a bias from another device and the added device (Yacht Devices) cannot accommodate a bias from the existing system. What is novel about the KUS is a custom calibration can be inputted which may accommodate the bias the existing gauges impose and may not impose a bias on the existing system. Hopefully, the KUS converter can simply read existing voltage and calibrate to that.
 
Last edited:
Nice find Tom! Up a little early this morning? Lol.

Unfortunately, while you could calibrate the signal from this and hence have calibrated levels on the N2K network, I think your other system would be off due to the second sensor added into the system.

or am I missing something?
 
Nice find Tom! Up a little early this morning? Lol.

Unfortunately, while you could calibrate the signal from this and hence have calibrated levels on the N2K network, I think your other system would be off due to the second sensor added into the system.

or am I missing something?
You may be right but it's a worthy look-see.
 

Forum statistics

Threads
112,942
Messages
1,422,697
Members
60,926
Latest member
dander88
Back
Top