I seem (?) to remenber that there is more to it than that, The amp meter
will read in reverse so these wire have to be reversed. Also are you still
running the dynamo or are you now with an altenator?? may be problems there
There were issues with how the original dynamos were earthed
Also the flasher unit must not the earthed type
You will need to get the lowdown from an auto electrical specialist.
Pinched this from the MG BBS archive:
Moss Motors in their parts catalogue have a very easy to follow instructions
on how to convert from positive to negative graound. Then you can install a
modern CD and radio. I converted my 67 ( MGB) using the Moss instructions
and it's easy.
best of luck
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