I’m troubleshooting my wiring for my gauge cluster as the cluster lamps are not working (1989xj). All my gauges work as well as all of my exterior lights work as they should except for the reverse lights, but I know that’s the NSS. I came across the below wires and connectors (see pics) when I put a voltage light tester in the connectors



they dim and brighten when I turn the headlights on and use the dimmer function. I can’t find a diagram showing these wires.