I have 2 sets of Tower lights ( front & back facing) the front ones weren't working so I started checking everything.
Ground is good to relay
relay is switching, toggle switch itself is fine
all connections are solid
Ground from switch is good
cable from switch to thru hull is fine and attached
The only thing I have left to check is that maybe the cable within the tower has a warn spot that is arching to the tower itself causing the fuse to blow or the connection from the light bar to the tower cable isn't good but that shouldn't make a difference. My only other thought is maybe the thru hull is bad. Other then that I am at a loss of what the issue could be. Both sets of lights pull power from the same place and are both grounded in the same place or are connected in line.