[Spridgets] 1275 engine/electrical question

[Chris Manuel]

Hi-

I just recently got a 1275 with the numbers 12V/671Z/L9922.  Looking around,
it seems like a post 1972 build.  

It looks like it was forcefully desmogged and plugged on the rail.  More
interestingly it also has an alternator.

Were these later models positive or negative earth?  Is there a marking on
the alternator itself?

Can't wait to dig into this one!

Thanks
Chris