Last night I arrived home with only 28 miles left in the tank. For home charging I routinely use my 50 amp /240 volt RV outlet to supply the Tesla NEMA 14-50 plug supplied by Tesla as part of their mobile connector set. Much to my surprise, after, perhaps a second or two of green charge flashing the charging light turned solid red. Of course, I did all the expected things like resetting the mobile connector and the circuit breaker on the electrical supply. And all to no avail. Even with assistance from Tesla. Naturally, we are located a good 50 miles from any other charging source so we were stuck until we came up with the idea of just using the NEMA 5-15 adapter (regular 110 volt wall socket). At least we were not completely dead in the water -- we could charge at 3 miles per hour. Anyway, the most significant item is that upon close examination, we discovered the Tesla NEMA 14-50 plug supplied by Tesla as part of their mobile connector set was defective. Look carefully at the top most flat blade as it enters the molded body. The way the plastic has melted can be seen. Now out of fairness, we don't know whether the heat originated in the Tesla plug or in the female socket into which it was inserted. Overall, this event seems highly unlikely. The outlet in use is rated at 50 amps and the model S limits the current draw to only 40 amps which should be well within acceptable limits. The mothership assistance in California said it's not common but they have heard of this problem as had the Tyson's Corner service center so it isn't a totally isolated problem. Simply a word to the wise; if you depend on such an adaptor you might want to carry a spare. That's what I'm going to do from now on.