[CA] [CA11] Connecting St5000+ to Garmin 4210

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Jamie,

The reported error may be indicative of a shorted hydraulic pump or a failure within the internal circuitry of the ST5000+ autopilot. The latter may be isolated by:
- disconnecting one of the motor leads from the ST5000+
- connect a voltmeter across the motor terminals of the ST5000+ and configure the voltmeter for measuring DC voltage
- command the autopilot into Auto mode and then quickly press the +10 button a couple of times while observing the measured voltage ... you are seeking to verify that a voltage other than 0 VDC (negative voltage is OK, as these systems utilize reversing DC motors) is reported then move to next step
- command the autopilot into Standby mode
- command the autopilot into Auto mode and then quickly press the -10 button a couple of times while observing the measured voltage ... you are seeking to verify that a voltage other than 0 VDC (negative voltage is OK, as these systems utilize reversing DC motors) is reported then move to next step

Should no voltage be measured in either of the tests specified above, then the autopilot would be deemed to have suffered a failure and would need to be replaced, as Raymarine can no longer service autopilots of this vintage. Should voltage be measured in both of the tests specified above, then the autopilot hydraulic pump would be deemed to have suffered a failure and would need to be replaced.

Regarding how to supply the Garmin system with heading data, you may want to consider installing a E22158 SeaTalk to SeaTalkng Converter (which has been updated with the latest available Raymarine product software update) as a backbone component within the currently installed NMEA 2000 backbone. When connecting the ST5000+ to the SeaTalk (yellow) socket of the SeaTalk to SeaTalkng Converter, the cable will need to be cut and then spliced back together, leaving the cable's red lead unspliced and insulated to prevent shorting.