Hi. Had this happen on my '13 last summer. I replaced the bilge pump, same deal. When looking over the schematic I found there is a separate fuse for the auto bilge. I assume the '15 would be the same. On mine, it's right next to the battery switch as shown in the photo. If this fuse is blown, should be as simple as replacing it. With that said, if it blew it's likely due to something affecting the pump's performance... its really easy to get in there and clean it up too which would be a great first step prior to replacing.

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