There is some controversy in the dreadlock community about whether you should use a daily conditioner on your locs- there is a risk, especially on new locs, that such products can loosen/damage your locs.
Dry hair breaks easily, and the last thing you want is brittle locs! Use a light leave-in moisturizer that will quench your locs' thirst, or water sealed in with a lightweight oil. You may find that your locs don't require as much moisture as your loose hair did, but don't test your luck- you should still moisturize regularly.