Terry: if you get a green light, then the RS125 is computing a valid GPS fix, however the Green light does not mean that the device is actually outputting that data, as there could be a problem with the Seatalk output curcuitry. There is a possibility therefore that the no fix fault you have is not actually to do with the sensor, but with the cable ( yellow or green cores). Yellow is data out to the Seatalk Bus. ?Green needs to be tied to the red for Seatalk output and it is tied to ground for NMEA output ( obviously if the green is still connected to red and gets shorted to ground, it will short out the supply voltage to the RS125 and there will be no light at all). If you have any other instruments connected on your Seatalk bus, you should check to see that data is getting from those devices to the Chartplotter (Wind, Boat Speed or Depth perhaps). If there are additional devices and you are not seeing any of this data at all, then it is possible that the fault is with any one of these devices, (including the RS125)
Irrespective of all of the above, the RS125 was first launched over 20 years ago and was not designed to last until 2025. The number of binary digits in the data word ?was not sufficient to allow it to compute date and time correctly after 20 years and so all Raystar 125¡¯s still in the field are computing incorrect time and date and although they will still compute Position, they will not allow computation of correct navigational data relating to ETA and for computation of Tidal information etc. - i.e. It needs to be replaced not fixed. As has been stated, depending upon the Chartplotter it is connected to, position can be input via NMEA0183 and for that, a cost effective device we sometimes use is the Standard Horizon SCU-31, which sells for around $100.00.
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Pete Waterson
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S38-2
Oriental, NC
Pete Waterson