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I need some DIY help. I just installed 4 Lutron Vierti Dimmers in a c.1939 coop apartment. The electrical in the apartment has been partially upgraded in the recent past with some additional 3-prong outlets and gfi’s in half the rooms but there’s no ground and minimum outlets in the other half. 2 of the dimmers work fine but two have resulted in outlets receiving no power. The two dimmers in question have a dual outlet directly below the switches. After I installed the dimmers, the qoutlets no longer received power. One dimmer replaced a single pole switch and the second replaced a single pole standard Lutron dimmer. The original switch and dimmer with their associated outlets below worked fine before I installed the new Lutron electronic dimmers. The box: inside the sitch box are 4 wires. I’ll call them A,B,C,and D and they all look alike with dark/dirty woven insulation over solid copper wire. A and B are coming from the top of the box while C and D from the bottom. A is spliced to C back away from the end and taped over. C is then pigtailed to the new dimmer. D is pigtailed to the dimmer while B is not attached to anything and loose with exposed stripped end. I have since capped the exposed end. Particularly with the dimmer-dimmer replacement, I am pretty sure that I re-attached all wires and the loose wire was already like that. I could be wrong. In any even, the old dimmer and outlet worked fine before and now the new dimmer works fine but the oulet below doesn’t anymore. Anyone run into this before or have a guess?