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Old 03-11-2014, 09:11 AM   #5
mid_life_crisis
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Kind of depends on how the manufacturer of the undercarriage lights says their illumination level should be controlled (assuming it can).
Meanwhile, as a simple on/off switch, your schematic will work, but personally I'd move the switch to between the Dome Light Power and the relay coil. Use the switch to control the relay coil, which then controls the lights.
I'm pretty sure the amount of energy discharged by the coil in this case is minimal. There should be no need for a capacitor to absorb the spike, but like the old lady with the chicken soup said, "it couldn't hurt."
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