Stowe Log Wiring

[Miken]

I am in the process of re wiring my instruments and have a Stowe Log which has 4 wires attached to it. I have figured out the + the - and the Light but there is an extra Blue one (Not the transducer thats seperate) anyone know what this 4th wire is for

Regards

 

[MoodySabre]

On the wiring diagram it is shown as a negative to the mechanical counter from which you can spur off to an optional Satnav. It is obviously not essential as someone has pencilled it through which I take to mean that it's not on mine.

If you would like the owners manual PM me with your email address.

 

[saltwater_gypsy]

The old Stowe Navigator 1 has 4 connections: 12v,Light,0V and S.N which had wire colours Red,Yellow,Black and Blue respectively. Like you I haven't a clue what S.N stands for!!

 

[MoodySabre]

SN = Sat Nav

I have the manual/diagram as a pdf file so I can't post it here but can only email it on request.

 

[MrGorsky]

The S/N provides open-collector pulses that sink to 0v 100 times every nautical mile. I was trying to use it to calculate the boat speed for a connection to SignalK, but it's so infrequent it's only really good for logging miles I think.