You can tell if the solder flowed thru vs sitting on the outside. If the solder iron and wire are hot it will kind of suck the solder into the joint. Visibly you'll see the coper wires in the joint with solder in between them and it really shouldn't flex much if at all. If it's on the outside u see all silver, like it was dabbed or smeared on if that makes sense. If prefer butane to electric personally and if i have the room i pulled the tip off and use the hot air torch as it gets hot quicker and easier to heat the wires.
07 vstar 650 midnight custom
Ais disable, 4.5 inch risers, V&H cruzers, jetted with pods, viking saddlebags, Kuryakyn mini boards and memphis fats windshield, fuel solenoids deleted, star solo seat and 4 inch extensions. Boss audio sound system.