Telecaster Wiring Diagram Seymour Duncan. Here’s the corresponding switching matrix: I'm not sure what you ask by 'the tapped portion is isolated'.
Click diagram image to open/view full size version. Article by ted alan florence. A photo or sketch may help.
Humbucker, strat, tele, bass and more!
Each part ought to be set and connected with different parts in specific manner. Remove the back plate and flip it over. Any or all these wiring diagrams can be found at the seymour duncan site or just google standard telecaster wiring and log on to images. I'm not sure what you ask by 'the tapped portion is isolated'.