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When you say a switch box are you talking about an a/b box?
If you would post a picture it might be easier to see what you're doing.
And you need a pull down resistor on the positive leg of the led. 

Goggle how to build an a/b switch box and click on images if that's what your trying to do.  There are some on there that are easy to follow.

Your jack has two solder points, i.e., tip and sleeve.  The tip is the input and the sleeve is ground.  So on your 3pdt board the IJ wire goes to the tip solder point of the input jack. The OJ wire goes to the tip solder joint of your out jack.  V - is your positive  voltage and the wire goes to the + side of your power jack. G- your ground wire goes to the - on your power jack and to the input jack sleeve solder point.  The I wire goes to the input point of your board and the O wire goes to the board output point. 

The reason I asked you to read the tutorial is for you to think of your 3pdt board as nothing more than a 3pdt switch without the board.  Every lug on the switch basically corresponds with your board.  Instead of going to the switch all your points are on the front of your board.

Go here

http://www.madbeanpedals.com/tutorials/index.html

There's a tutorial at the bottom on wiring a 3pdt.

In/out jack tip wire goes to the tip of the respective jack.
In/out wire goes to the in and out on board.
Voltage is positive power.
Ground is self explanatory.

Read the tutorial all the way through and you should have a good understanding of what to do.

Success to you on that monster.  After looking at the build docs and my not so good success rate with the complicated builds I caved and spent the $350 for a finished one.  Still haven't had time to play with it but the YouTube videos sold me on all the things you can do with it.

I must tell you, $350 for a finished one is a very good bargain. I wouldn't be willing to build one of these for someone else for less than $500.

That was another thing I just couldn't get past, the time involved in puttting it together and then just dreading a "No Fire Up."  Troubleshooting is not my forte and the thought of over $200 worth of electronic pieces not functioning just didn't sit well. LOL.  I'm sure you'll blow this out of the water though.  I don't post much on here anymore but I do follow things and you put together some really nice stuff.

Success to you on that monster.  After looking at the build docs and my not so good success rate with the complicated builds I caved and spent the $350 for a finished one.  Still haven't had time to play with it but the YouTube videos sold me on all the things you can do with it. 

Out of pretty much boredom, not necessity, I went back to work in February.  Building pedals kept life interesting and productive for the last 4 years.  Ive got a box full of boards in various stages that I go out a couple of times a week and work on.  After working as an adult babysitter (I'm a construction manager for a new home builder) for 9-10 hrs just going out and soldering a couple of parts just relieves a lot of the days frustrations.  I've got two of the pedals I've built on my board (a Pale Horse and a Bolviator) so I too have gone the commercial route for the most part.  But I still get a huge sense of satisfaction when I get one of these things to work.  I still scan the board daily just to see the interesting stuff going on.  Pickdropper's builds and enclosure finishing still just amazes the heck out of me. 

Gordo my wife just shakes her head when she goes back and looks at the mass of pedals I've built so I know exactly where you're coming from. 

And Cliff after having that DD-500 you sold me for a year it is on my board now.  Echo delightful. 

Awesome.  Congrats 🍾🎊🎉🎈

Please post your outcome.  Thanks.

I purchased my tube from the same place and my build is working.  Not saying that your tube is good, just saying mine was ok. 

Well disregard that. I plugged mine in and it worked then I remembered I needed to set the trimmer.  My voltages are running the same as yours.  This can't be a coincidence that my voltage at T1 and T2 are almost the same.  I'm pulling mine and getting another one from a reputable place. 

Man you've been busy.  I have to confess I have the Postfontaine, Vomit Comet and Sagan 2 pretty much populated but can't seem to push through to complete them.  The White Horse looks really good.  But no new board designs in a while and I can see why now. LOL.

Are you using a GuitarPCB 3pdt board or one from somewhere else?

Looks super.  How does it sound?

Arrow is the best for stocking me up with packing paper which I use for a variety of things. 

Oh man I can't believe you built one of those.  It only has 5 knobs but I guess you can count the switches to get you to 9 things on top lol.  Looks great.  I just couldn't resist ribbing you on the low knob count though. 

Finish looks really nice.  Great job.