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Hi, I have a bluetooth speaker device that takes a DC input of 8V to 24V, How would I wire up a switch to allow me to power it via these 3 different power inputs? 1. a 12v car battery for when we're travelling with a cig socket on it, 2. a 12v wall wart for when we're at home, & 3. an 18v Makita Lithium Ion battery for when we're camping. I'm able to do the wiring up so that each works as a separate plug in, but to have all three options on a switch would be easier than plugging/unplugging internal plugs every time.Cheers
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