Etec-Lowrance NMEA 2000 interface

[Pathfinder]

I'm hoping someone has the info I need to get my 200HO Etec and I-command gauges communicating properly with my Lowrance LMS 337. I have had a problem for months and my dealer admits he doesn't have a clue. So I'm trying to get this corrected myself. Unfortunately, BRP tech support won't talk to me on technical issues - say I have to go through my dealer.
Through Lowrance support and the my own research, I now know that the interface between the Lowrancenet and the Evinrude NMEA 2000 consolidater hub is not wired correctly. The cable that leads from the consolidator hub to the Lowrancenet tee is there but I thnk that the terminator in the consolidator hub should be removed and a 120 ohm terminator added to the last Lowrancenet tee. Does that sound correct? Does anybody have a wiring diagram that addresses this?
On another note, I beleive that part of my problem might be incorrect wiring of the Evinrude Sensor Interface Module(SIM). The installation manual for the I command gauges shows the SIM connected to the network and to the fuel tank sending unit. My dealer has installed a Lowrance EP15 fuel level NMEA 2000 convertor from the fuel tank sending unit to the network, but has not conected the SIM wire to the fuel tank sending unit. Should both be connected to the sending unit? Or do I even need the EP15 if I have the SIM?

[Springseeker]

Pathfinder,I don't know if this helps or not but I have a 150 E-tec on a full Lowrancenet bus and I don't have the consolidator bus from BRP.
I simply ordered an adaptor plug from a dealer that just plugs into a lead at the EMM the same way as all the other devices plugged in.Everything works perfectly.Sorry I don't know the part # but all it is is a 4 prong plug hand wired onto a Lowrance wire. On this set up you do need a 120 ohm terminator on each end.

[mead]

so what are you trying to use the LMS 337 for?
What are you trying to show on the LMS337 that you are not seeing.
Are your existing I-Command gauges working OK?
You do not need the EP15 with the SIM.
if the SIM in not connected to the pink wire for the fuel tank sender the SIM does nothing.
The SIM will not show fuel level on the LMS 337.
The system needs a terminator on each end. The terminators on the hubs are sufficient. You do not need to swap them over.

You should be able to use the adaptor for the hub (Deutsch to Lowrance blue twist lock) and connect to the NEMA harness on the LMS 337. I have seen it work.
Be sure to check the pin-outs of the adapter to the hub.
on the deutch connector the pinouts are:
1- CAN white
2 - CAN blue
3 - blank or shield wire
4- red - nema power
5 - black nema ground
6- blank unused

[Pathfinder]

Ok, now this is starting to make some sense (sort of). I use the LMS 337 as a gps and depthsounder but I also like to display some of the EMM data on the LMS337. I am seeing all the data I want to see on both the LMS 337 and the I-command gauges. I am also getting fuel management data on the I-command gauges which I thought was coming from the SIM. Is that data coming from the EP15?

The problem I have been having is that my gauges work fine until I turn on the Lowrance. Then the alarm goes off on the gauges and the digital fuel level indicator starts to recalibrate from 0 to 10%, 20% etc until it reaches the fuel level in the tank. Then it starts all over...0%,10% 20% etc. in an endless loop, all the while the alarm is going off.

When I go into the NMEA bus setup screen on the LMS337, it shows the LGC2000 (gps), EMM, EP15 and 2 other unidentified devices one of which it identifies as manufactured by Teleflex. The other device has no info associated with it.

So I guess this is a result of having both the SIM plugged into the network (but the pink wire not connected to the fuel tank) and the EP15 connected to the fuel tank and network?

Sounds like I should connect the SIM to the fuel tank, and disconnect the ep15? Maybe I could connect the EP15 to the oil tank instead.

I currently have 2 adapter harnesses - 1 goes from the hub and is connected directly to the LMS 337. This harness has a hand spliced connection between the Lowrance cable and the deutsch plug. Lowrance has advised me that the spliced harness will set up an impedance and should be replaced with a factory harness. The other harness is a factory harness (no splice) and connects to a Lowrancenet tee which connects to the EP15. Lowrance has also advised me not to use the y cable that came with the LMS337 but to run a separate cable from the LGC 2000 to the Lowrancenet.

[mead]

use the EP15 for the fuel level.
ad another EP15 to thesender in the oil tank.

remove the SIM. Can't say for sure but it looks like the sender calibration in the SIM is conflicting with the digital gauge and its calibration sequence. Even tho it is doning nothing it is still plugged in to the network and therefore becomes a reconized device.

The EP 15 will convert the fuel tank sender analog signal to digital. Accuracy will be no better that the quality of the tank sender. You can use the main gauge to calibrate the sender for best accuracy is you want.

[Pathfinder]

If I eliminate the SIM, won't I also be losing the fuel consumption data (gph) that I am currently getting?

[mead]

No - you will still read GPH because this is an engine output. The SIM has nothing to do with reading instant fuel burn. The gauge is designed to make the calculations.