Okay, I know this sounds easy but not for me. On my non- Hatteras, I have three small red indicator lights on the bridge that light up when the bilge pumps run. Sounds easy. I have a fourth red light that is supposed to light up when the genset is running. But, one of the wires corroded off from the base of the light. I want to replace it now while the boat is laid up including the genset. Assuming that there are no markings on the light itself, is there any way to tell whether it is 12v or 120v short of waiting until I recommission the genset? The two wires going to it are identical in color. My guess would be 12v because it is on the bridge even though it is supposed to light when the genset is running. Also, the wires coming from it are very thin, maybe 22 gauge. Any help would be appreciated.