Tesla Model S UMC cut open and modified to J1772

[davewill]

That's only the case once the car has pulled it down to indicate desire to charge. When idle with no car connected it should be +12V DC.

Your point about CP not normally requiring a core in the cable is a good one however.

One possibility for extra core(s) is temperature sensing - I believe the HWPC(v2) has temperature sensing in the plug; possibly UMC(v2) has it too?

You're right about the square wave not starting until insertion. I had never noticed that detail before.

 

[WhipperDipper]

I’m looking to take a J1772 plug and cable, and wire into a Tesla HPWC Gen 1. Looking for diagrams if anyone has one. Will use a 14-50 wip cord to supply power, 50A breaker, dip switches set to 40A.

L1, L2, and PE are easy. Anyone know what the blue and purple wires are coming out of Tesla cable?

 

[TEG]

Connecting Tesla Charge cable to OpenEVSE box

...The only thin wires you will use are the purple pilot wire and blue charge port transmitter. If you have WiFi you can send the blue right to the 3.3v output of the WiFi controller. All the grounds are the big green wire. the small white, black and orange are not used...

 

[WhipperDipper]

This helps a little bit. I’ll research this route to see if I can reverse engineer somehow. However, I’m trying to do the opposite: Tesla HPWC box with J1772 cable/plug.
Thanks for the info.