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John, that coil may be fine. As Frank stated, it’s probably a bad solder job. I haven’t ever seen a coil button that moves, but who knows. Other not applying to much heat at the coil button, the other challenge is holding the wire steady enough until the hot liquid solder solidifies. Strip the end of the wire back the minimum amount to make the connection. Maybe 3/16″ or so. Use rosin core solder, with no flux. I tried flux with the rosin core, and it didn’t work for me. I believe the solder has the flux included.
Regarding plug wire, you need 7 MM copper core wire. I have purchased 100′ rolls for around $50.00, but I work on motors frequently. Not many auto supply places carry this wire anymore, but a few still do. Someone pointed out that it was available online from a lawnmower supply also. Ebay and Amazon should have smaller quantities available. Four feet should be plenty for your motor to do both wires.
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