u/Cold_Librarian4596

So we need help jumping a 2018 F Pace diesel. we have it all hooked up (pictures included) and when we connect the jumper cables to the battery negative, the horn starts honking nonstop. the car probably hasnt been started in about 6 months (long story) but we can’t get it to start after having it hooked up to a running car (2025 merceded glc300). any tips would be appreciated.