I have a 2013 F150 Ecoboost, with the tow package and approx. 3800 kms. We have a 19' ski boat that weighs roughly 3000 lbs. and have towed it approximately 4 times with no issues. The other day as we are driving back the lights on the trailer (no electric brakes) went out, I checked the fuses and it looks like 67 & 73 have blown. I have read that with the tow package there should be a special fuse I'm not sure though. I have been told by the dealer as it is under warranty and that the battery needs to be disconnected, we need to take it to them to replace the fuses. Any clues as to why the fuses would suddenly blow?

 

Did you back in the water with the lights connected? Most boat trailers recommend disconnecting lights before entering the water, as even sealed ligt units can leak.

 

That is one thing we make sure off disconnecting lights before backing into water. I thought it was kind of strange that this happened.