I have a 1996 g20. All of the lights on the circuit feed shown in the service manual picture I have attached below are out. Also, the rest of the lights connected to this branch are out. The switch does work and feeds battery through it. The connectors to the bulbs are not getting battery when the switch has turned them on. I believe I have traced my lighting outage problem to this box (Joint Connector-1) or close to it. I want to probe inside this box but I can't seem to physically remove the white inserts inside the black box. It looks like the white inserts could be removed but maybe not. Can someone suggest a way to get access with a voltmeter lead in or around this box?