[klondike98]

Welcome to the Phorum!!  I can help with the electrolytic cap question but you need to add some photos to help folks figure out what wires you are talking about.  Its always helpful to provide a link to the schematic on Nostalgiaair but for some reason the site seems to be down today.  Anyway, looking at the schematic I have, there are two electrolytic caps; #58 (a 16 uF cap) and #61 (a 12uF cap).  These caps use the metal can as the negative lead.  Cap #58 has the negative connected to the chassis (ground).  It does this by having the cap can (the negative lead) in contact with the chassis.  Cap #61's can is isolated from the chassis by means of rubber washer type insulators.  There should be a metal ring with a lug on it or some type of lead that allows you to connect the negative to the centertap of the transformer.  The positive lead on both caps is the lead coming out the bottom of the center of the can.

You can restuff the cans or disconnect them and put the new caps under the chassis.  I like to stuff them. Some info on doing that here.  I also found a few pages of a 40-180 restoration with nice photos that might be helpful.

Update: Nostalgiaair seems back up.  40-180 schematic here