Several people have found it difficult to get the 1W led that I specified on the grid charger schematics as a current indicator.
The 1 W led shown above works pretty well, but I have blown out two of them with the surge current that happens for a split second when the charger is first connected. This simple circuit uses a 6.8 ohm resistor to develop about 2.3V@ 350ma.
The 47 ohm resistor controls the current through the LED.
The total cost will be less than the 1Wled, it will not get hot so no heatsink is requied,and it will not blow the led with the initial current burst when connecting the charger