Bilko wrote:sideout wrote:Finally got around to fitting my SIP Lambretta speedo today.
I'm running a Wassell full DC system on the bike in question, a SIL GP.
Connections
I followed the instructions (maybe

) but essentially there is a "powerbox" which connects between the device and the power supply. 3 wires need to be joined into the headset: Red = Battery +12V; Brown = +12V supply to the lights; Black = Earth.
Need a bit of help here. I'm running DC
My power box has the black, brown, red, but theres another black (arrow) coming out on it's own the other side of the box. Any clues to where that one goes would be gratefully appreciated.
That black wire should be in a plug! (At least it is in mine!)
Mine is a V1 and has the 3 wires on the input side and 4 wires going to a 4 way plug (well socket to be technically correct) which connects to the speedo. The little connector on the end of your spare black wire slides into the back of the socket.
If you have a full Wassell dc system your brown input wire has to be connected to one of the yellow wires on the Wassell rectifier. The SIP speedo relies on the AC ripple to calculate the revs which is missing from the "lights" circuit on the Wassell dc system.
It seems a bit scary connecting direct to the output of the stator, but apparently it works. (No responsibility taken if it blows up

)