One last clarification in the spirit of not trusting BTC private keys to a non-core wallet:
I assume it is possible to first transfer all BTC out of a wallet (after the fork has occurred) and then copy the wallet.dat file to the ABC wallet, rescan and all BCC should show up. Is that correct?
Yes.
I transferred all my BTC out of my Bitcoin Core wallet after the fork occurred so they are in a new Bitcoin Core wallet safe. I then copied my Bitcoin Core wallet.dat file to the new Bitcoin ABC wallet on another computer. It shows my BCC balance as 0 in Bitcoin ABC wallet. Any advice would be greatly appreciated.