Custom Norton Dominator 650ss Wiring Diagram (Greg Marsh Enterprises)

Grant Tiller

Greg Marsh from the Access Norton forum reached out to ask for some assistance with a wiring diagram.

Greg is doing some work on a Norton Dominator 650ss – a bike I adore.

The wiring is in a bit of a mess, so Greg is in the process of sorting it out.

It has a tympanium regulator/rectifier fitted already as well as a Boyer Bransden electronic ignition in lieu of the original magneto.

Greg reported that the original wiring didn’t even have a fuse, which was a little worrying.

He’s loosely basing the tidied up electrics on the pre-1971 Norton Commando wiring.

It’s definitely worth popping over to Greg’s website and seeing what he’s up to – there is some great stuff over there!!

So without further ado, here is the Wiring Diagram!

Custom Norton Dominator 650ss Wiring Diagram – Greg Marsh PNG 3066×1841

Grant Tiller

2 replies

  1. Nicely done.
    You mentioned he had no fuses and was a bit worrying. I don’t see the fuses labeled on your diagram, and what size would they be, 15A?
    A concern a friend has is if he needs to install a fuse between the Tympanium and the battery. None of the diagrams show that, I never had one in that location with a similar rectifier/regulator unit (Mitymax).
    Comments on why one would go there, and if it was needed, will be appreciated.

    • Hi Terry,

      There is indeed a fuse in the diagram.

      Here is a version of the above diagram that highlights it for you:

      Click Here to see fuse location

      I would recommend a 15 amp fuse for this sort of application.

      A 10 amp fuse would be fine if you were running a magneto instead of electronic ignition.

      In some of the other diagrams I have on the site for Norton Commandos with aftermarket ignitions and higher powered charging systems, you will see that if I wire the reg/rec directly to the battery, then I will use a dedicated fuse.

      Wiring the reg/rec directly to the battery is not an option on a bike with an ammeter, because it would never swing to a positive charge.

      Hope that helps,


Leave a Reply

Your email address will not be published. Required fields are marked *