The issue was that I am an idiot. There was a separate 12v switch for the auto pilot main unit that was not being switched on. It was a little deceiving in that it did power on though, but as it turns out it was getting 12v via the Sea Talk Cable, coming from the GPS
. Had it not powered on at all I would have suspected power rather than a faulty drive arm. Anyway I guess the low amp current
coming through the seatalk
cable was enough to engage the drive arm sometimes, but not often.
To correct I removed the 12v wire from the seatalk
connection to the drive unit since I think sea talk is not supposed to have 2 sources of power, then of course turned the 12v power switch on.
Works like a champ now.
Thanks everyone who posted.