Quote from: Zogrd on November 25, 2017, 04:43:29 PM

I kept my BTC pre-fork (both) in an Electrum Wallet.

Now I transferred BTC to Ledger Nano S. Electrum is now empty.

How do I get BCH and BTG to the Nano S?

To get your BCH: Download Electron Cash (a Electrum fork for Bitcoin Cash), import your old Electrum wallet and send your BCH to your Nano S Bitcoin Gold address.
To get your BTG: the easiest way I found to get your BTG from an Electrum wallet is by following this guide[1] (requires an android device).

[1] https://www.reddit.com/r/COINOMI/comments/7d72jm/has_anyone_succeded_in_importing_private_keys/dpzad48/