Alternator warning lamp

[Barahona Alonso Francisco Javier <javier.barahona@aeasa.com>]

Dear friends,

Months ago somebody advised me about the possibility of substituting the
alternator warning lamp (3W, 12V) for a diode plus a 480 Ohms resistor.
Making calculations I obtain that I need a resistor of 48 Ohms instead:

        R = (V
2)/P = (12
2)/3 = 48

I do not know which is the resistance of the diode. Could somebody confirm
me which of both resistors, 48 or 480 Ohms should I use?

Best regards.

Javier Barahona (Classic #187)