Should the Trutrack VSVG follow the heading bug of the AF-4500? I am using the ARINC interface between the EFIS and AP. If it is, it doesn't. Checked pinouts and cannot find an error. Also configured 4500 per instructions.

On the ground with A/P on and O° bank displayed in A/P window I get one servo cog every 2 seconds to the left. Turning the A/P knob to 2° right bank stops the left roll command.