Join Date: Dec 2017
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You could try some white EL wire. You can get it off of amazon for cheap. It's easy to form, you can trim it to length, and you could just run it off of a battery pack instead of having to slice into wires of the car. Of course you could probably just get an inverter and plug it up to the car. There's a bunch of tutorial videos about EL wire in cars on youtube.
And actually there are a few EL wire kits with the lighter plug I see.