Art,
The initial HV battery SOC when you start the charging will determine the current drawn from the grid, and should be a rough indicator of output current, but you really need an ammeter and voltmeter on the output circuit to know what is happening with any degree of certainty.
If you open Peters grid charger box, and run it with the cover open, you will be able to put a voltmeter across the big power resistor. This voltage will depend on the output current going to the pack, and will act like a current shunt. Once we know what the minimum and maximum voltage that is across the resistor when the pack is empty or full, a simple led and additional resistor would allow you to see the led brightness change as the current changes during charging. Instead of an led, an analog or digital voltmeter and series resistor would allow direct reading of output current.
Based on Peters initial test, and the resistors 33ohm value, it looks like a 1000 ohm resistor and a 20 mA led across the power resistor should work nicely as a current indicator, just make sure that the LED polarity is correct.
On my grid charger with the constant current supply, I was able to simply put a 350ma 1W led in series with the charger output. When the charger is at its cc , the led lights up fully, and as the max voltage is reached (adjustable), the current rapidly drops off, and you can see the led brightness also drop to show that you have reached the full charge point.
http://www.99mpg.com/projectcars/mim..._display.jpg,0
