it wasnt too bad on my truck because there was already spots to connect to the running light circuit in the pass. side fuse box... the instructions came with the measurments to line them up on the roof. i just siliconed every where and its been raining since i installed them so i think im good to go
then it should be real easy then. the connectors they supply you with are really nothing impressive, i ended up zip-tying them together so i dont end up having one come apart and having get above the head liner just to push it back together.
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