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I'm planning to tap the mirror power ideally to power both a dash cam and a radar detector. I know I need a 12V-5V converter to step down the voltage (then I'd split the output of that converter to go to both the dash cam and the radar detector), but I don't know whether there's enough power to pull from there to power both devices simultaneously. Would be great to hear from anyone who is powering two devices from that source. Thanks!
 

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To err on the side of caution, I think a total additional load of 0.5A will be safe. That wire might support more, you will need to measure the voltage drop under the load to determine the limits.
 
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