My masthead Nav light stopped working all of a sudden. Other nav lights are fine. Bulb is good and I cannot find the problem> Any ideas/

Thanks,
Clint
Wet and Wild
1972 4' Cinnabdeer

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Check the connections at the bottom of the mast where it tilts.

I would make sure to verify that the bulb actually is good. I have been snookered more than once by a bulb that looked okay AND tested with reasonable resistance but would open when power applied.

It could be as simple as corrosion in the socket or a bad ground, but I assume you checked that out. If you  put a meter on the socket, do you get 12v? If not then as Dan said, check the base. It is probably a mess from almost 50 years of service. If you don't have 12v there, then check to be sure the switch is good and the breaker isn't tripped. If the switch is good and you have no power under the mast, it gets really fun. My 45' brings the wiring into the electrical bees hive on the starboard side of the closet behind the dc breaker panel. The wire is all the way outboard. Outboard of the bridge bundle. It is a real pita to get to. There could also be two or three other wires there, depending on the model. You will then have to follow them to the connections. If you can't find the wire then you will need to follow from the switch. If you get this far, that was the easy part. Finding the connection that went bad is going to take time and patience.

I've owned my 45' for eight years and over time I removed the connection spaghetti and ran all new wiring. Problems like this are why I did it. Good luck.

Billy K.

 

I found horrible wiring in masthead so replaced all wiring from the mount to the new light fixture. Anchor light works fine but I am  getting only 8 volts to the white nav light .   At the base where the wires come out of the boat and connect to masthead I also am getting only 8 volts. Can any one tell me the route for the wire from the switch to where it attaches to the masthead wires so I can find and fix this voltage drop?

This might not be helpful but first I'd scrape the connections with a knife just to ensure they're corrosion-free.  If still not working, check the source with a power meter - if no power you might have to walk down the line for a connection that corroded or broke free.  I'm a novice so forgive me if these are "no duh" suggestions. 

If all three are getting the same voltage I would start at the switch and grounds. 

J Clint Cheveallier said:

I found horrible wiring in masthead so replaced all wiring from the mount to the new light fixture. Anchor light works fine but I am  getting only 8 volts to the white nav light .   At the base where the wires come out of the boat and connect to masthead I also am getting only 8 volts. Can any one tell me the route for the wire from the switch to where it attaches to the masthead wires so I can find and fix this voltage drop?

8 volts makes me think corrosion at the switch or nearby connections.  My guess is the voltage goes to zero with a load.  Check resistance across the switch,  if it is the problem it may be hot.   The original switches could be disassembled and cleaned.  If this is not the problem work downstream to the panel. 

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