This has me stumped. Red/port light works, but green/starboard doesn't. For the green light, using a multimeter, when the bulb is out I get about 12 volts with one probe on each of contacts where the bulb fits into. When I put in the bulb and again check the contacts I get no voltage when I check the two contacts and the bulb doesn't light. On the red light, when the red light is on I get about 12 volts when I use the probes on the contacts where the bulb fits into. The bulb is good (checked continuity and checked that it worked elsewhere) and I sandpapered all contacts. Any ideas?