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My car charger socket is way on the bottom console, and stretching the cable all the way up is damn ugly. Actually, this pic is version 1 where I epoxied the stick directly to the EZPass tag. Thing came off fter 3 days.
Step 1REmove the dome light
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Open the sun glasses holder & remove the screws. Then take a small screw driver, pry open tthe driver side lense, the remove the third screw. Push the whole dome assembly towards the back, pull down and the whole thing will come out, Disconnect the wire harness.
I realize later the 2-part epoxy is still not strong enough in the EZPass directly.
Wiring for my C-240 was much, much harder:
http://www.instructables.com/id/Direct-wire-GPS-mount-EZPass-holder-for-Benz-C24/