We found that ours was not working when we had her surveyed. There were two issues:
1. The bearings were seized in the anemometer
2. The main connection was corroded and cracked. Picture attached.
I asked Bill Rouse about the issue and he sent me the following response:
B&G Wind Speed
If the Wind Speed is inaccurate in light winds and sometimes zero, it is almost always the Wind Speed Sensor Part# 210-10-038 about $150. See attached:
B&G Masthead Unit 213 exploded view.JPG
If the Wind Speed is zero and the 213 MHU wind cups are turning, it could be lots of things including in the order of probability:
We ended up replacing the entire mast head unit as well as the cable.
SM #440 Cara