Autohelm St50 wind instrument showing 00 knots wind speed

[stav]

Having just put the boat back in to action I went for a sail today (max speed 0.8knts)! But it was sunny with a swell. But did notice the wind speed was reading zero and making a low hum. Wind direction OK. Spinny things at top of mast present and rotating slowly. No different when motoring at 7knts.

Refurbished mast head unit over the winter and was working.

Anybody know where there is a good secondhand/refurbished one.

Are they serviceable?

What might have broken?

Any suggestions?

Thanks in advance.

 

[Pye_End]

Connector?

 

[Sheff]

With the assistance of a multimeter these two links may be a starting point:

https://raymarine.custhelp.com/app/answers/detail/a_id/397

http://www.catalina36.org/node/2009

 

[stav]

Thanks for that really helpful, will save that for a non sailing trip to the boat.