joseph,
there had been discussions on this topic. it is wrong for any "mechanic" to mess with the electrial system and electronic systems associated with it. please request the moderator for the previous discussions on this matter. it is a recurring question that has been anwered in the past. we are regurgitating this again. do not disconnect any battery terminal while the engine is running if you don't want electrical damage or electronic surprises. again, request for previous threads on this.
jick






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