Seatalk Cabling - Raymarine ST1000 Plus Tiller Pilots Owner's Handbook Manual

Chapter 4: Installing the Tiller Pilot
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The following table shows the minimum cable size acceptable for the
power supply:
Cable length
Up to 2.5 m (8 ft)
Up to 4 m (13 ft)
IMPORTANT:
Correct power cable size is critical for correct autopilot
operation. If in doubt, use a heavier gauge cable than specified. A
lighter gauge cable might cause a voltage drop between the
supply and the autopilot. This will reduce the power at the tiller.

SeaTalk cabling

12 A fuse
CAUTION:
Protect the power supply for the SeaTalk 12 V (red) line with a
5 A fuse (or equivalent circuit breaker) fitted as close to the tiller
pilot as possible.
The tiller pilot requires its own dedicated power supply – it cannot
source its power from SeaTalk.
Power should be taken directly from the boat's central
distribution panel and protected with a 12 A fuse or equivalent
circuit breaker.
Copper area
1.5 mm
2.5 mm
Supply (0 V)
Supply (+12 V DC)
SeaTalk
instruments
AWG
2
16
2
14
47
Socket
Yellow (SeaTalk data)
Screen (SeaTalk 0 V)
Red (SeaTalk 12 V)
with 5 A fuse
SeaTalk
interface cable
D366-2