Note that it is not necessary to go from ‘internal’ regulator, to ‘external’ regulator.  The internal voltage regulator gets its feed for the field current directly from the alternator output.  You can still use the internal regulator, you just have to ‘break’ the internal connection from the alternator output to the regulator.  No other parts required.

 

This was written up in CONTACT! magazine years ago, and if I’m forced (well, actually if anyone is interested) I will see if I can dig it up.

 

OK, it is issue #46, Sept-Oct, 1998; page 6.  It applies to Mitsubishi alternators.

 

Al