So a bag for $14 at Costco - I'm not that rich.
If the signs are less than 30 years old, the wires are probably tinned copper, not aluminumAluminum wire was not common in any size smaller than 12ga.
why don't you put male and female plugs on the wire endsthen plug in when in useif not, just make sure connections are tightthere is a tendency for the al and the cu wires to loosen during usethis is where the special paste comes inyou could go to lowes or home depot and purchase the pasteits not real expensivebut, yes, you can do what you want.
The wire on the exit signs are silver in color but are probably not aluminum, usually having some content of nickel causing the silver appearanceBut I can't see the wire over the internet, but if you really think they are aluminum you need to find connectors that are labelled cu/al that have a special antioxidant contained in the connectorIf they aren't aluminum the special connectors won't hurt a thing.
