I'm hoping that someone here might be able to help me out with regards to upgrading my 1977 620 alternator & external voltage regulator from the current 35A with an FN style connector to a 1980's 720 internally regulated alternator that outputs 60A with an LS style connector.
From what I can gather I need to connect the S terminal of the T-connector to the BAT terminal which goes to the + terminal of the battery. Then the L terminal of the T-connector needs to connect to the CHG wire which goes into the dash I believe.
What I'm wondering is how this relates to the FN style T-connector, and how to eliminate the external voltage regulator? I don't want to just take out the 35A alternator and directly replace it with the 60A unit, as I am afraid that if I wire it up exactly the same way as the 35A is currently wired, that I might damage the 60A alternator, or that it might not actually charge the battery because of the external voltage regulator (which I think may be bad as the 35A alternator tested good at Advance Auto).
Can anyone who is familiar with this swap/upgrade provide me with some detailed instruction on how to perform this work without causing any damage or issues with the setup?
Thanks in advance!

Check out this link...http://community.ratsun.net/topic/31990 ... y-new-way/


I put a Saturn alt on my 78 620 Lil'Hustler and removed the external voltage regulator. Just need to be aware of the choke heater wire.

http://community.ratsun.net/topic/7830- ... o-wire-in/