[ercoupe-tech] Alternator

[Percy]

Greetings, group wisdom.
  I am assisting an annual on an Ercoupe.  The plane has an alternator
installed In Accordance With Falconar of Edmonton, Alberta, Canada. 
There is an Approval of Aircraft Modification from DoT Canada.  There
is no STC or FAA 337 showing; only an entry in the logs.  Is this OK?
If not, what is needed?  
  Percy in NM, USA