What solder to use on basic automotive wiring?

60/40 used to be the "accepted" ratio. make sure it specifies on the box for electrical and ROSIN core and not acid core

actually radio shack solder if still open, is OK. I heard they are goin out

one thing you can do is use the above pliers. i think betts and klein make em. use bare uninsulated crimp splices and solder them after crimping then put a short sleeve of heat shrink. you can buy less pricy heat shrink from people like moser electronics in like, 4 ft lengths.