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Russell H.
Russell H., Service Tech
Category: Marine Electronics
Satisfied Customers: 11244
Experience:  8+ years of professional experience
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How do you hook up the wiring from a Garmin 741xs

Customer Question

How do you hook up the wiring from a Garmin 741xs Chartplotter to a Floscan fuel monitoring system?
Submitted: 2 years ago.
Category: Marine Electronics
Expert:  Russell H. replied 2 years ago.

Hi, thank you for contacting My name is Russell. I will do my best to provide the right answer to your question.

I may be helped in answering your question adequately and correctly, by knowing what model of Floscan you have.

But if your Floscan is a model 7000 series, for instance, then I have to say that there may be no way to connect it to your Garmin device. It is not listed as having an interface (e.g. NMEA type) to any other device, just as being engine mounted or engine-connected (as is, obviously, necessary).

The Garmin device you have, is pretty capable of displaying engine data. But: does it have NMEA connectors or ports on it? other than NMEA, it has Bluetooth and WiFi connectibility capability... it can do Bluetooth and WiFi to other devices... but, the Floscan (model 7000) apparently has no such capability.

You would need a Floscan - or some other vaguely similar device - with NMEA or with WiFi or Bluetooth interfacing capability, to connect the tachometer/fuel-meter/etc. to the Garmin device.

Let me know what model of Floscan you have. Or what you might need further in the way of advice for this question. Thanks.

Customer: replied 2 years ago.
The model of Floscan I have is series 9000 Gas-NMEA 0183 input. And my Garmin doesn't have the ports but it has extra wires coming out of the power cable.
Expert:  Russell H. replied 2 years ago.

What wires come out of the power cable? number of wires, color of wires, and how thick they are or their 'gauge'.

Customer: replied 2 years ago.
My Garmin GPS map 741xs has two internal NMEA 0183 ports. The blue wire is internal port 1tx, the brown wire is internal port 1rx (in), grey wire is port 2tx (out) and violet wire is port 2 rx (in). What color wire would NMEA & BNC center terminal on GPS be? The white/orange wire from the flowscan hooks to this. What is NMEA ( - ) BNC shield terminal on GPS? Is it a ground on GPS or a color coded wire? The green/black wire from the flowscan hooks to this.
Expert:  Russell H. replied 2 years ago.

I would give you the information, but Garmin does not have the model # ***** stated


though Garmin does have information on the similar model #s:






so please - to obviate my giving out incorrect information owing to any confusion as to model #s - double-check the real model # ***** from the inscription on the manufacturer's label, and let me know what it is. Thanks.

Customer: replied 2 years ago.
That's what it is listed as in the west marine catalog, as well as on the unit itself. I've attached pics for you to see. I'm not sure what else I can give you. Thanks
Customer: replied 2 years ago.
Sorry also here is a couple pics of the back of the unit.
Expert:  Russell H. replied 2 years ago.

If I cannot find information on that model #, I may be unable to provide authoritative info on it, I'm sorry to say - but now that is confirmed, and with the additional information, I will do more research and see what I can find that is definitively correct.

(This may take quite some time, so don't wait for my next posting - it may be tomorrow sometime. ... I have other cases to take care of today and tomorrow morning, you see.)

(Thank you again for the effort of getting that info and those photos to me.)

Customer: replied 2 years ago.
No problem thanks a lot , look forward to hearing back from you.
Customer: replied 2 years ago.
Here is some additional info that may help.
Customer: replied 2 years ago.
Just checking , are you still working on this?
Expert:  Russell H. replied 2 years ago.

Yes, here I am.

Your Garmin 741xs is better known as a 'GPSMap 741xs'.

Garmin's own page on this device says it has NMEA 2000 connectivity, i.e. it has no NMEA 0183 ports.

The Floscan 9000-series has a NMEA 0183 input (not output) and then the Garmin GPSMap 741xs has NMEA 2000 ports. To connect one to the other you will need an NMEA 2000 to NMEA 0183 converter, such as this one, for instance:|344|2028705|2028879&id=2006001

Expert:  Russell H. replied 2 years ago.

This is based on presuming that your Floscan series 9000 is this device: