Article first created: 5 Mar 2016
The original cars were fitted with a Lucas C40 dynamo.
Positive to negative earth
The C40 can be re-polarised if converting the car from positive to negative earth.
This is quite straight forward but I cannot remember all the steps.
The battery needs to be turned around
The dynamo needs to be repolarised by stroking the coil with a positive feed.
The C40 outputs a maximum of 20A.
This is black box unit mounted on the nearside inner wing. This unit regulates the output from the dynamo. Diagnosing a regulator is not so easy although I am sure there are methods. If I suspected a regulator was faulty, I just changed it. These units are easy to change.
Refer separate post about making a conversion (is quite easy)