Having just had a Digital Plate put on I have seen how much effort it is to get power to the trunk lid. #1 it's a bear to go up the provided wire harness on the one side of the trunk, but my guy managed to do it. WD-40 is your friend.
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Then #2 getting the inside piece off was something he never managed. Ended up just popping a couple of clips and doing it all with the tiniest of access (probably why #1 was so hard).
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Oh, #3 remember the skin is thin aluminum, it will dent with the simple pressure of the drill to start a hole.
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I assume you know about getting power to the T so I will not talk about the other end of the run. For mine, I needed full-time power that went to the battery.
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Final Result, Digital License Plate. That's obviously not my plate number, when it was uploaded to the plate it also changed orientation.
-Randy