We installed a Lowrance AP on a 24' Thompson the other week. Calibrated with the rudder position and did the 390 degrees turn calibration. It's connected to a Lowrance hds live 12" unit. The heading sensor is mounted on the dash. Day 1 it steered great, day 2 and 3 it would hunt a little then after say a mile or two it will start with a sharp S pattern and get to where it's useless. We turned it off and on and it would continue with the S pattern.
Any ideas where to start with it?
Thank You