As a rule of thumb,,,--- Gold will conect to Gold ,,,,,On your flat ribbon cable ends 99.9% of them will only be spot plated only where the Gold connects to Gold ..
For your power supply cords and such ;;; I heat up around 5 gl. water on the ol turkey cooker , to less than boil and heat the ends (use safety here) using long tongs I reach in get a plug and use pliers to pull out the BRASS ends. Yuo don't have to use a turkey cooker you can do small amounts on you stove top....
hope this helps
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