You don't *have* to disconnect the battery to change a rear wheel speed sensor on a 1999 Dodge Dakota, but it's generally recommended as a safety precaution. The risk of accidentally shorting something out is low, but disconnecting the battery eliminates that risk entirely. It also prevents any potential issues with the ABS system while working.
While the job itself doesn't inherently require it, disconnecting the battery adds a layer of safety and simplifies the process by ensuring the electrical system is completely de-energized. It's a quick and easy step that minimizes the chance of complications.
