random question on wiring 12v rocker switch

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Paul2129

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Hi guys, forgive a slightly random question, but it's something that you guys will probably know the answer to, 

I'm doing a little project in my car, looking at an on/off/on  rocker switch. it describes it's use as terminal 2 being supply, and terminal 1 and 3 being loads

now I'm a bit dumb (you'll know that if you've seen some of my other posts) but rather than one source of 12 volt power and two loads, I want to two selectable supplies( either/or ) and one load (so one switch position will be the car 12v power to use when the car is running, and the other will utilise a USB power bank instead to provide power for my accessories when the car is off.... after I switch the switch)

essentially I'm asking, will the switch work in reverse ? ..... and am I on the right tracks with this kind of switch ?

cheers in advance

Paul

 
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