Solder doesn't stick wires to connectors
175C is pretty low for soldering. Low temperature lead solder ("63/37") melts around 185C, RHoS solder even melts around 250C. You also do not seem to use flux - do it. The solder flows fast and evely if the pads/pins have the right temperature. If you have problems with soldering in general check solderingguide.com, the soldering is easy comic or the tons of videos on youtube.
- Apply flux to both the connector and the wire.
- Stay away from lead-free solder; use 60/40 Tin/Lead solder.
- Use copper wire. (I've rarely seen solder not bond to copper wire; what are you using?)
- Simultaneously heat both parts that are being soldered. The solder should flow onto both of them. You will see that the flux assists this greatly.
Flux is very important. When it heats up, its acidity "eats away" the thin layer of corrosion that can prevent the solder from making contact with the metal.
Never use the abrasive to clean the tip of your soldering iron, by the way. (In case you're tempted.)