I'm a complete newborn on this so bear with me. I recently purchased a 2008 Yamaha AR230 and just realized the stern light isn't working. I tested with my volt meter and I get 12v if I put the black probe on the battery ground post and the red probe on the hot lead in the stern light socket. However if I put the black probe on the other lead in the socket I get zero volts. My question is, is this normal? My light won't work when plugged in and I even tried a new light and it didn't work. What could be the issue? All other electrical components on the boat are working properly including bow lights.