Just picked up our new Model 3 AWD this morning! (Well, my wife's). Everything looked perfect.
When we got home I couldn't plug the HPWC (second gen) connector handle into the Model 3 far enough to start a charge. It has always worked fine for my Model X, over a year and a half. I also couldn't charge a loaner Model S in March. And we don't have the second HPWC wired in yet.
Long story short, a plastic tip from one of my Model X charge port large sockets had broken off and lodged itself at the bottom of the corresponding HPWC handle hole. Still worked fine for the X, since it had a tip-less socket plugging into the charge handle with the tip stuck in it. But with an intact charge port on the Model 3 there was a normal tip on the 3 and an extra tip stuck in the charge handle. That prevented the handle from being inserted all the way into the Model 3's charge port.
I turned off HPWC power at the breaker. I couldn't pry out the broken tip. Using a very thin drill I was able to free up the tip and shake it out of the handle. The drill didn't really make a hole in the plastic tip, but certainly loosened it. Of course, be careful not to drill the center pin or the outer shield. Sorry I don't have a better solution, but that's how I fixed it.
Comparing the Model 3's charge port to my Model X charge port, the two top pins on the 3 have black plastic tips. The two top pins on my X have a flat metallic end to them. So I've had a second plastic tip break off, but it didn't get stuck in (my) charge handle. Could happen with Superchargers or UMC's too.
TL;DR - If your charge handle won't insert far enough, look into the connector holes. If one or both of the big pin holes has a black base, there's probably a piece of plastic down there that is interfering with full insertion.
When we got home I couldn't plug the HPWC (second gen) connector handle into the Model 3 far enough to start a charge. It has always worked fine for my Model X, over a year and a half. I also couldn't charge a loaner Model S in March. And we don't have the second HPWC wired in yet.
Long story short, a plastic tip from one of my Model X charge port large sockets had broken off and lodged itself at the bottom of the corresponding HPWC handle hole. Still worked fine for the X, since it had a tip-less socket plugging into the charge handle with the tip stuck in it. But with an intact charge port on the Model 3 there was a normal tip on the 3 and an extra tip stuck in the charge handle. That prevented the handle from being inserted all the way into the Model 3's charge port.
I turned off HPWC power at the breaker. I couldn't pry out the broken tip. Using a very thin drill I was able to free up the tip and shake it out of the handle. The drill didn't really make a hole in the plastic tip, but certainly loosened it. Of course, be careful not to drill the center pin or the outer shield. Sorry I don't have a better solution, but that's how I fixed it.
Comparing the Model 3's charge port to my Model X charge port, the two top pins on the 3 have black plastic tips. The two top pins on my X have a flat metallic end to them. So I've had a second plastic tip break off, but it didn't get stuck in (my) charge handle. Could happen with Superchargers or UMC's too.
TL;DR - If your charge handle won't insert far enough, look into the connector holes. If one or both of the big pin holes has a black base, there's probably a piece of plastic down there that is interfering with full insertion.