Any solder should be good. I've tried to use leaded solder where possible due to it's easier use.
The key to soldering is heat and flux. The flux makes it easier for the joint to flow but you still need to keep the heat on for long enough and apply enough solder. It's hard to explain soldering as I've years of experience doing it but I'm sure there are some videos on YouTube that may be useful.
Practice on a few other connections beforedoing any for your car. That way you'll get a feel of the solder flow.
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