Basics first...
I don't know how far you've gotten into the wiring, so take this for what it's worth... first make sure that you've got power from the battery to the main bus on the back of the fuse panel. You can do this with either a lighted 12v circuit tester from an auto parts store, or with a voltage/multi meter. If you have power at the panel, then check the fuses and their sockets. If they're like mine, they're corroded beyond repair, and will have to be replaced. If they're OK, move on to the lightbulb socket (or instument) in question and check for voltage across the terminals. Lastly, make sure that the connections on the negative or ground side are solid. You could check for resistance between a negative lamp terminal and a good known ground like the mast step, and if there is very little or none, you know your ground (on that circuit at least) is good. If you think of electricity as hot water running through a system of valves (switches) and faucets (bulbs) and then drains (grounds), it may help. Do not however, attempt to run electricity through your sink. A book on 12v wiring will help greatly. Good luck, Bill
