They say amps are what kills you. It’s not true. You need a trifecta of current, Voltage and resistance. And usually it has to go through your heart, causing an arrithmea. Though I have seen people get their hands blown off on a 400V system.
Your body has a very high resistance. If your hands are sweaty and you place them directly on a couple of 12V terminals you might get a tingle (I’ve done this several times on accident on 24V bateries).
That’s why I always laugh at the movie trope of people being tortured with battery cables.
But there’s more. Electricity takes the path of least resistance so in this case it would probably bypass your body altogether.
But as soon as you connect this you’ll get a giant spark (basically how welders work). If that doesn’t perturb you and you somehow successfully connected this, it would get REALLY hot and burn you before it shocked you.