Question about Raymarine RL70CRC GPS Receiver

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Wiring of seatalk instruments

I have a catalina 400 mark II sailboat equiped with Raymarine ST60 wind,St60 Speed, ST60 depth, type 150/400 Autopilot system, ST 6001+ Autopilotcontrol unit, raystar 125 GPS receiver, Raynav 300 GPS Plotter and hsb2 Plus series Color LCD Display. recently I had some sort of surge in which the gps failed and on inspection there was evidence os burn on the gps 125 receiver board. At the same time the ST instruments failed however the 300 GPS plotter still seemed to function as does the LCD Display. I do not have a wiring diag for the "as is" connection of this system. The system is supposedly run together with seatalk wiring. I am not certain how the power is connected to the system except to say the 300 plotter , the 125 GPS receiver have direct power while the remaining instruments are getting power from the seatalk connections but which one is the source or having the voltage is unknown. Where might I get a wiring diag for this system? The 125 GPS has been replaced and new cable run. The unit indicates it is functioning correctly by indicator light but the signal is not being receiver by the 300 Plotter nor the RL70C display. In reading the type 150/400 Autopilot manual, there is discussion of a course computer which does not seem to be part of my system as I cannot find such equipment and assume the 300 Plotter has been substituted. All fuses otherwise,have been inspected and are fine.

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OK, you are confused. Seatalk is a bus system, using 3 wires , (power +, power-, and Data.) red, bare and yellow repectively. So Red and Bare are 12V and ground. Since the 125 shows a green light, it is getting power and outputting data. but is it seatalk?? to make a 125 Seatalk, you must hook red and green together to 12 V, so check that first. if green is grounded or not connected, that is the problem (or one of them)
Next divide system to its' simplest terms, so hook the GPS straight to the display ST60, and see if it works red to rd, yell to yell and bare to bare (sometimes black) One by one hook the others into the chain until they all work or failed device takes down Seatalk network. If you are missing 12V on a seatalk leg, check 5A fuse in course computer. If you have a pilot, you have a course computer, unless it is ST4000 wheel pilot, and then the brain is the display (course computer is built in to ST4000 display)

Posted on Jan 17, 2010

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