You don't have to disconnect the battery if you don't disconnect the airbag. You can unscrew the airbag but you can't disconnect it. I've done two carriers and you don't have to unhook it, just unscrew it.

Having said that, best practices dictate you disconnect the battery any time you are working on a cars electrical system especially the airbag. With all the airbag nonsense going on right now, it may not be a bad idea.

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