Can someone let me know what the proper way to take a voltage reading from those 8-pin Hopper Power Cables?

I do not see any exposed metal contacts as the male pin connector has the contacts within the housing.

The male/female clips join together with a click and does not expose any contact.

Is there a proper technique that is used to get the voltage reading?

My initial thoughts were to push in a small wire into each of the holes in the connector allowing me to take the reading from there. Not sure if this is the suggested method.

Any tips would be appreciated!