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Home >> BMW >> 2024 >> M4 Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System -- Repair M4 (G82 & G83) >> 12 42 Starter Line >> 12 42 651 Removing and installing/replacing the positive battery cable remote positive terminal alternator (after vehicle diagnosis) (M4 AWD models, 2021-2023) >> Removing the positive battery cable from the alternator to the auxiliary terminal for jump starting

Removing the positive battery cable from the alternator to the auxiliary terminal for jump starting

WARNING: Working on 12 V electrical system  .
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
NOTE: RISK OF DAMAGE 
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS)  .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults  .
  • Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.
NOTE: TECHNICAL INFORMATION 
When the engine is stopped after the completion of trip, it may be necessary to run the electric fan. In rare cases, operation of the electric fan can last up to 11 min. This protects the components. In this case, replacing the electric fan will not remedy the problem!

Preliminary work 

Positive battery cable of the alternator 

G15296995Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Working on 12 V electrical system  .
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
WARNING: Hot surfaces  .
Risk of burning! 
  • Perform all work only on components that have cooled down.
G14927396Courtesy of BMW OF NORTH AMERICA, INC.