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what does this blocker do? what does this product do exactly?
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The Bully Dog 40400-105 Universal OBDII Block is specially designed for the Watch Dog and Gt Tuner. It supplies power to the unit. You'd only have a use for this if you need to replace the power cable on your WatchDog , GT Tuner, Mini Maxx or Blackmaxx Tuner that has a malfunctioning OBDII block.
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