ST4000 MK1 not powering up

[Chuck - Raymarine - Moderator]

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It is recommended the vessel be connected to shore power, that its batteries be permitted to fully charge. After doing so and while still connected to shore power that the pilot be tested again. Should the problem persist when so tested, then it is recommended that the voltage level be monitored at the ST4000+ wheel pilot's power terminals when the problem occurs. Should the measured voltage remain within the autopilot's operating range, then it would appear that the pilot has suffered a failure. If seeking additional guidance, then please respond with information regarding measured voltage level before and after the pilot was switched ON.