Some yutz who had my house before me did some amateur wiring in the basement. Trouble is, the house has aluminum wire, but he added in copper. Based on the Cu-Only outlet that burned up because it was attached directly to the aluminum, I'll bet he didn't know anything about aluminum and just joined the copper and aluminum together. Second problem is, I don't think he did the junction inside any of the existing outlets or switches, because I can't find where the original aluminum meets the new copper; all the boxes I've looked in either have all copper that looks new or all aluminum that looks original. Is there a nice way of finding where the wires are routed without having to take down the drywall? The gizmos that plug into an outlet and have a sounder to trace it all look ridiculously expensive; it would be cheaper to just replace all the basement drywall.