Quite a while ago I posted this and wanted to follow up with charger rewire info incase it helps someone in the future to avoid a little ewaste, have a spare charger, or fix an otherwise unfortunate issue.

I eventually conned… uh…talked a friend of a friend who’s a technical electrician (not the kind that comes to your house) into taking a look at the device. He did his magic and I’ve tested it charging another vehicle @12amps without issue.

>!Standard disclaimer:!<
>!This is NOT A HOW TO.!<
>!DO NOT DO THIS.!<
>!ELECTRICITY IS DANGEROUS.!<
>!CARS, HOUSES, and HOSPITALS ARE EXPENSIVE.!<
DONT HURT YOURSELF, YOUR PROPERTY, OR OTHERS - ITS NOT WORTH IT.

>!I ASSUME NO LIABILITY!<

His quick notes to me follow.

Factory input cable contains FIVE conductors.

Observed cable colors:

Black = AC Line / L1
White = Neutral or L2
Green = Ground
Red = Thermistor lead
Orange = Thermistor return

======================================================================
RECONSTRUCTED INPUT SCHEMATIC

INPUT CORD
-------------------

Black ------------------+
|
EMI FILTER
|
RELAYS
|
J1772 L1

White ------------------------------ J1772 L2/N

Green ------------------------------ Protective Earth

Red -----------+
|
[NTC]
|
Orange ---------+

======================================================================
THERMISTOR CIRCUIT

The red/orange conductors are NOT power conductors.

They are connected to a thermistor embedded in the original molded wall
plug.

Purpose:
- plug overtemperature protection

The EVSE monitors resistance across:
- RED / ORANGE

If the thermistor is missing/open:
- the EVSE may refuse operation
- indicate fault
- disable relay engagement

======================================================================
EXPECTED THERMISTOR TYPE

Most likely:
- 100k NTC thermistor @ 25

Possible alternate values:
- 47k
- 68kk

Behavior:
- resistance decreases as temperature increases

======================================================================
REPLACING MISSING THERMISTOR

Initial test value:

RED ----[100k resistor]---- ORANGE

Suggested resistor:
- 1/4W

DO NOT short red/orange together.

======================================================================
120V FACTORY WIRING

NEMA 5-15P

Hot -> Black
Neutral -> White
Ground -> Green

Red/Orange:
connected to thermistor inside plug

======================================================================
LIKELY 240V COMPATIBILITY

The internal construction strongly suggests universal-input operation.