Can anyone advise the procedure for getting the voltage output reading from the alternator/regulator to display on the radio screen on a 2003 Mercedes C-230? I have been able to do this in the past on a 97 E-320, but do not recall the procedural steps involved.

I think you mean the climate control screen.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

You are correct, it is the climate control screen and the model is a 2003 C-240. Sorry for the incorrect information.

You can search for that info. I think you have to hold the rest button down. And maybe the setting has to be on LO to start with.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra