I was planning on mounting them outside. I really don't know which relay I should use, or if I should even use a relay. I just want them to be on when the car is and off when the car is off. Any ideas? Thanks for your help.
You don't particularly need a relay for something as low powered as LED's - you just need to connect their live connection into a circuit thats only live when the Ignition is on, however it's always good practice to install a fuse and inline switch too.
That said - those one's don't look very waterproof....
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