It is sad but for all the wiring I've done in my life, I suck at soldering. I did fine when I installed my head unit a few weeks ago but man I am having trouble tonight. I'm real inconsistant like that. So anyone have any tips for soldering wires together? I usually twist them together then hold the iron on them for a while and add solder from the opposite side as the iron. Its just not working for me right now. I'm trying to wire the connector from my 1 wire O2 sensor to the 3 wire one I just bought. The wires are fairly heavy on the wire thickness(not more than maybe 18 guage but the wire inside the insulation just seems hefty). They are not copper and I think thats a big problem I'm having. Taking forever to heat up. I let the wires sit on the iron and walked away, when I came back like 5 minutes later it still wasn't hot enough to melt solder. I'm using a flux core solder too, think that may be an issue.