I would like to provide power from dome light to windshield mounted radar detector (Uniden R7 with RJ-11 plug) and dash cam (Auto-Vox D6 Pro with micro USB plug). Radar detector runs off 12V, the cam needs 5V, 1A. My rear view mirror has no power. Is there a way to do this simply or due to different voltage dash cam has to be powered via long wire from cigarette plug adapter with USB socket? If dash cam cannot take power from dome lights I will only make a tap for radar detector. I can use digital voltmeter but have never done this before. How to make proper connections at dome contacts? Please give your ideas, suggestions, etc. Links to related wiring schematics, videos, articles, photos, etc. would be highly appreciated. I thank in advance everyone who responds.