Hobot, I think they were there on all Commandos, but don't know that for a fact.
Believe Land Rover used to use the same connectors.
I have some old heated gloves and heated vest that use that style connector.
The problem is that over the years there have been so many plug types:
- Lucas = old 60's-70's bikes and gear
- SAE = H-D, etc
- Powerlet (DIN) = BMW, etc
- Coax = Gerbings, etc
- Cigarette lighter sockets = completely unsuitable for motorcycles (vibration/moisture/compatibility/etc)
I have items that run off each of the above.
Personally, I've been thinking of switching the Norton over to either a Powerlet connector (best connector for motorcycles - IMO)
http://www.powerlet.com/
My 2004 R1150RT comes standard with two and they are waterproof, vibration-proof, and very useful.
or scrapping it and just running an SAE style connector in it's place (very universal)
I've wired my 1974 R90S with these for charging and running accessories, charging phone, etc.
I use a BMW Battery charger that is good for FLA, GEL and AGM batteries. It has a proper indefinite maintenance with automatic switching to the charge cycle and back. It is built by Deltran (Battery Tender) and they have verified to me that it is also okay to be used for charging their LiFePO4 batteries.
It comes with the charging cable as an SAE termination, but also includes an SAE to DIN (Powerlet) cable/adapter and an SAE to battery post cable, plus an SAE to jumper-cable adapter. Over the winter last year I had three vehicles in the garage that I maintained the batteries on by simply going out once a week and pulling the charger lead (SAE connector on the charger) and pluging it into one of the other two vehicles. This rotation kept all three in top condition and required virtually no work on my part.
$69 at MAX BMW
https://www.maxbmwmotorcycles.com/fiche/PartsDetails.aspx?source=&diagram=ST_BATTERYCHARGER
I've looked a little but not found an adapter to go from the Lucas female to an SAE or female Coax, or female DIN. That is why I figure I'll replace it or simply leave it and put a Powerlet or SAE on the opposite side. My feeling is that the left side is far less problematic to have something connected there than on the right side where the kick-starter level and one's boot might catch or snag the cable.