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Little AV project

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Hi, I couldn't think of anywhere better to ask the questions.

I'm wanting to make a switch box for an AV Video feed. I'm fitting 2 bullet cams to my car, one front facing, the other rear facing, and I would like a toggle switch to flick between the feeds.

There is one that I can find on the market, but its waaaay to pricey for what I consider to be a simple item.

Could someone give me some info on how AV (RCA) plugs are wired, what wires I would need to switch etc?

Thanks in advance.
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