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Clean wire (Post #13) and use rosin core solder.
 

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Wow! Thanks everyone! I am using an (old) spool of really thin electronics solder. .032 " flux core. AS for the green being the issue for not being able to solder..... what about the tinned wire? Same issues of the (high) heat being drawn away from the joint enough to char the plastic.... but not melt the solder.

Found this page. now the debate of rosin vs. flux : ) ??


AS for why to solder? 'cause I thought it would be easy, I have the tools and thought it's better than crimp connectors.

And I was hoping the flux would deal with the corrosion / green for me.

Does flux dry out / dissipate on the spool? That page is from 1981.... I wouldn't doubt that solder is....40 years old! I had thcker solder (I usually wind some around the power cord so I always have some handy). but that was used up / found this thin stuff before the 'normail' diameter spool.
Try to solder some different but clean wire using same gun and solder.
 
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