Wind Instrument Problem
I have a similar problem with my Data Marine setup. It worked when the boat was on the hard until the yard pulled the mast. I have concluded it's a wiring issue. The only thing I did was disconnect the round connector at the masthead when I rewired the mast. The idiots who chose this connector used a silcone grease on the BRASS contacts. Gold plated contacts should have been used instead. I can call them that after spending 20 years in the aerospace/defense connector industry.You might be able to check the function of the sending unit and the instrument head without it being attached to the masthead provided the cable that runs down the mast and sending unit are still intact.If you don't have another connector at the bottom of the cable run, you can hook the individual wires up directly to the instrument matching the existing color code. Don't lose the color location of each wire on the strip. Make a diagram. If there is a connector on your cable, do not cut it off without knowing you can get a replacement. If it's a solder termination, you can use solder wick and de-solder it to salvage the old one. Otherwise look for a replacement pair with gold plated contacts. I can direct you to some inexpensive ones if needed.If the anemometer still spins, you should get some kind of reading because you've gone directly to the instrument bypassing the mast step connections. It might indicate a bad connection somewhere between the connections at mast step and the instrument head.If you don't get a reading, try going to the mated pair of connectors at the sending unit to see if there is excessive corrosion on the contacts.I found that to be the case on my unit. Lots of green stuff. I tried cleaning mine with electrical contact cleaner. Radio Shack used to carry this spray. CAUTION! I may have created my own problem by not flushing out all the contaminants and if they used a conductive silicone grease, it might have bridged between two contacts and shorted it. I have apparent wind but no wind speed. If you are not dealing with a environmentally sealed connector and you are in a salt water environment, not only will those salt deposits corrode unplated contacts, it will act as a semi-conductor creating an electrical path between contacts. Found this hard the hard way on a very expensive military system that was originally designed for use in a computer room and then used in an outdoor, high humidity enviroment. Bob