Need help locating the ground bus under the helm to help troubleshoot a steering issue. My steering wheel vibrates for 10 seconds or so after starting. My dealer has not seen this before and nautique told them a steering calibration should be done. I did that and did not help. The next step was to check the connections on the helm panel and ground bus. I checked the helm panel including the power steering breaker and did find a loose connection. Tightened that up but did not help. I do not know where the ground bus is to check those connections. Can anyone help?