resistor only matters if you might be using them for turn signals to make it flash the same speed. Read further up what bigmike posted about the draw of these lights a 2 amp fuse seems to be more than enough
Now to compare this with these little LEDs that only draw 0.0038 amps each (0.023 amps / 6 LEDs), you could run 4,210 LEDs per switch before you melt it! WOW! Your entire truck would be glowing!! And that's only on one switch and one circuit!!
