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How to tap into ignition wire of car?


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I drive a 2003 Highlander, I am going to run a relay for the amps in the back using the remote wire from my head unit. But my concern is for my voltage meter. I could run the wires front the voltmeter allll the way to the back where the relay is located, but if I can access the ignition wire in the engine bay or something I would rather do that. Any suggestions? I am not 100% sure what I am looking for.

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