Andrew is likely correct and the wiring was done at the factory, in which case, in a 2017 premium model like yours, the power would be coming directly from the battery, and not wired through the boats harness. On the outside chance that your boat was ordered with no electronics, and all of the wiring was actually done by the dealer, then you need to be sure that the units are direct wired. Those two units use a lot of power and need direct wiring. I appreciate the comment about a dealer water testing a boat before delivery also. When I bought my 2013 Cougar from Sherm and travelled 400 miles and across an international border, he water tested mine beforehand, and actually found an issue that he resolved for me before delivery.