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For the switch in the cab you'll want one wire going to the relay, one going to ground, and one going to a power source. What power source is up to you. If you want to be able to trun the lights on with the motor turned off (not a great idea in my opinion) run that wire to a constant power source. If you want to have the lights available only when the car is running, run the power wire to a 'switched' power source. You'll need to buy a circuit tester to find one in the fuse box.
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