How would I add a relay to turn on a new device when the car is on?

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That explains the two red wires ( don’t think I’ve come across that before). I’ll give it a go this week. I didn’t really care about not having a radio, but now I’m trying to revamp some of the things that were never finished on the car. I thought the blue wire was a draw stright from the radio to power on an amp? I don’t think there’s a left over blue wire from the wiring harness, just those two reds and a black.

Newman, you don’t think the Radio fuse goes to one of the red wires? I’ll put the fuse on the voltmeter and see what happens when I turn the car on. Would be pretty cool if that works. I guess my concern is if I tapped in to something not designated for the extra draw and end up blowing fuse after fuse.

I’ll give it a go, never had to go in and play with the cars electronics before, but better time to learn now than never :headbang:

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that blue wire is also the same wire you use to power on an amp. you use the blue wire coming out of an after market head unit to power on the amp. or the radio ignition wire with an inline switch.

trust me.