I am trying to hook up terminals to a 10AWG PV wire to power a water pump with a battery. I got 12-10 connectors, the yellow colored ones which I understand are sized for 10AWG wire. I stripped some of the wire and the stranded wire bundle fits nicely in the yellow connector's wire barrel. The problem is that the PV wire insulation does not fit in the connector's insulation, and the connectors box says:
The stripped conductor must be inserted into the wire barrel until the insulation is against the wire barrel but not inside it. The insulation of the wire must be inside the insulation of the product.
What am I doing wrong here? Did I get the wrong sized connectors, and if so, what am I looking for to add terminals on this PV wire? I need to make another hardware store trip today and want to learn what the issue is before I go so I can get the right parts.
Here's some photos of the issue. First is the wire and some connectors I got, showing size labels. Next couple photos are the connectors up against the wire insulation to show that the insulation of the connector cannot fit around the insulation of the wire.