SFC1000 alternator - paired blue/white and yellow wires - what are they for?

[stivesvelo]

As a no-electrical type of person (can follow wires on a wiring diagram) In the process of reassembling the bike having dismantled it about 3 years ago, I'm just putting the wiring back in place and find that the yellow and the blue/white wires from the alternator which go to the regulator/rectifier have been paired up but don't appear to have anything to connect to and wonder why they are there?

When I bought it long ago it had a DMC 1 ignition system & later on replaced to with the later optical system, these don't appear on any wiring diagrams & wonder if the connectors had anything to do with a previous ignition system or suchlike?

Any suggestions,

Also being a pilloc, forgot to put the earth which went under the battery tray, now looking for another location as I don't want to take it out again!

 

[henrywillms]

They are just duplicates of their color coded mates. They are from the three phase alternator and go to the regulator, ignore the duplicates.

I cant see my bike right now but I think I ran this ground to the crankcase breather bolt.

 

[Andy]

As Henry says, they’re just duplicates and you can leave them disconnected. Nobody seems to know what they’re for, but we’ve all wondered and asked the same question you have
The earth to the frame can go anywhere convenient, remember to remove any paint from under the lug and add a smear of grease to prevent corrosion. The engine earth commonly bolts to the crankcase breather but I prefer it on the starter motor bolt, where the greatest power is required.