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What would be the best way to hardwire my radar detector? Use a Relay or would just splicing in to an accessory wire in the radio harness be fine?
 

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Using a Relay would probably be the better way to do it, but overkill if your only in need of one On/Run Power supply.
 

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Detectors only draw 150 to 250 mA under full alert mode, and much less under non alert conditions. Just tap it into any key on 12 V wire. Be sure to use a fuse in the power feed line (5 A would be fine).
 
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