Ok, your post is just a little confusing; There's no point in giving power to pickups, you want to get power from them, not give power to them.
Anyway, without being able to see how the model is wired from the factory it's hard to give any advice in any direction except to say it would be beneficial to use the tender pickups if you can as well as the locomotive pickups for getting power to the LM, the more pickups powering the LM the merrier!
- Tim