Ignition switches typically have two 12v outputs. One for essentials fuel ignition etc and another for non essentials heaters etc. non essentials are disconnected when the key is in the start position.
Try putting a small 12v bulb across the battery to check its good while you run tests and fit another with 2 long leads. Tie one lead to battery negative and trace the 12v supply from switch to starter/ ignition unit
I suggest bulbs rather than a meter as you can't damage them! And give a more subjective reading dim etc
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