If you need to, you can get replacement power adapters from PowerBook Medic for around $25 USD. They are sold in the same black config as a 1400 adapter. Also try ebay and the like.

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Thanks for the tips. I have just secured a good deal on a 3rd-party power adapter, and should have it in hand this coming week.

Somehow, when that plug was made Apple snuck in a resistor and tied it in series between either tip-to-sleeve or ring-to-sleeve. I don't recall what the ohm value was (I think somewhere around 47 ohms or higher). Somebody may want to try and trace out the schematic for that plug. I don't have my original anymore, since I threw it out a while ago.

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Indeed. There is almost certainly a 3rd circuit in there somewhere that handles the bi-color LED for the charge indicator.
Hopefully by this time next week, I will have all the parts together and the iBook repaired. The battery seems to be in decent shape. It did successfully charge and support the iBook for over an hour of time.