I don't remember who, but they advised to use = good copper crimp on connectors. I replied, yes but they all look like = aluminum to me.

I have a selection of connectors picked up = over the past couple of years from various sources, Napa Auto Parts, various = FLAPS, Camping World, etc, etc. I cut a variety of them with wire cutters... = nothing that looks like copper on the inside. Then I tried a magnet.... none of = my connectors are attracted to a magnet. I'm no metallurgist, but they ALL = seem like aluminum to me. I even tested an #4 wire connector that looks like = copper on the outside.... no magnetic attraction! Can anyone tell me what gives = here?