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Hi just bought one of these 12v draper soldering irons that plugs into your car cig lighter, but its dawned on me that the ignition is going to have to be on for it to work. Is it safe to solder wires in a car that have power running through them while the ignition is on?
Should have got a gas one really. Which wires are you soldering? I can't see much problem if they aren't in use, not all of them will be energised at once.
You'd need to check that the metal parts of the soldering iron are isolated from the car body and also live supply completely when it's in use to be certain.