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Re: Proper way to tap into 12VDC wire?
Well, the "gob it all in a wire nut and tape it over" school of design won't win any awards but it can be perfectly safe and effective for a very long time.
You can replace that with a small bus bar, or place multiple rings over a stud, although IIRC all the standards say no more than two rings on one bolt. I don't know any simple, cheap, elegant standard way to do it except a bus bar or distribution panel, or new wire runs back to one.