Depending on what you get as far as wattage, a lot of times you can splice directly into the parking lights or even the headlights. The downside is that you don't have control over running the fog lights independant of the other lights, but for most folks that's a non-issue. I've done this in a number of my vehicles and even used power from the parking lights with a switch bypass in the cab... really for no good reason.
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