NMEA wire explanation please

[Bluewathersailor]

can anyone please explain which wire goes where when connecting to a S3 course computer to the NMEA terminals

I understand that the red wire goes to the power in V+
And Brown look like the NMEA + in
Black yellow and screen are all join togather and shows smart pilot NMEA - and battery negative
This bit have lost me , do they mean connect to the NMEA -in all three
or
to both NMEA-in and the battery v- while taken then through a block and taken one wire to the NMEA in- and the other to the battery v-

 

[Martaine2005]

Yes, according to the diagram, Black, Yellow, screen, Battery (neg) and NMEA (neg) all connect together.

Martin

 

[Bluewathersailor]

Hi Martin
So can I connect black yellow and screen together to J box a then take two wire from the block one going to ( nmea neg in ) on the course computer and the other to a battery neg ,
Sorry to ask again just want to are sure I got it right .
Bloody thing cist enough without blowing it up first time I connect it .

 

[Martaine2005]

According to the diagram, that is how it's wired. Provided of course, that diagram is for your unit.

Martin

 

[Bluewathersailor]

According to the diagram, that is how it's wired. Provided of course, that diagram is for your unit.

Martin

Yes it is , thanks Martin

 

[Bluewathersailor]

Back for more help guys .
The GPS has been filtered to the NMEA connections on the S3 computer ,
But there a problem ,
The speed over ground on my Raymarine display shows up but less then a minute after I turn on the chart plotter the display shows --- and so do the plotter , turn off the plotter and less then a minute and the display once again shows SOG .

GPS is given a fix on the plotter so it working .

Any ideas why once the plotter turn on that it's lost its SOG and how I can correct it?

Thanks