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Most automotive relays use less than 1 watt (thats right one watt) of power. So if your acc line is fused with a 5 amp or higher fuse (the lowest fuse in my car is 10 A) then you will be fine. Go relay crazy, just make sure you are only using the acc to trigger the relay and not provide power tho, as people have said earlier.
And they are right about the voltage meter, they are passive electronics which means they do not put a load on the circuit you are monitoring.
Good luck.
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