Originally Posted by bmweuro
Thanks for the drawing. What size resistor did you use?
Nearly any type of resistor may be used. It can be the old-fashioned type called 'carbon composition', or any modern type of 'film' or 'deposited carbon' type....or even a 'wire wound' type. The resistor value CAN be 470 ohms, but my tests indicate that 330 ohms is better.
from the same Snowbum article: The GEN lamp is rated at 12 volts and 3 watts. Ohms law says that the lamp resistance is 48 ohms when energized by 12 volts. I guess I'll poke around an autoparts store or radioshack...
EDIT: found this from Snowbum
too about the Gen lamp:recommended 168 lamp = 4.90 watts, .35 ampere, rated 1500 hours, a.c.