2014 Jeep Wrangler JK Factory Service Manual 04 - Vehicle Quick Reference

Jump Starting

STANDARD PROCEDURE - JUMP STARTING PROCEDURE

WARNING:

Review all safety precautions and warnings in the battery system section of the service manual.

  • Do not jump start a frozen battery, personal injury can result.
  • If equipped, do not jump start when maintenance free battery indicator dot is yellow or bright color.
  • Do not jump start a vehicle when the battery fluid is below the top of lead plates.
  • Do not allow jumper cable clamps to touch each other when connected to a booster source.
  • Do not use open flame near battery.
  • Remove metallic jewelry worn on hands or wrists to avoid injury by accidental arcing of battery current.
  • When using a high output boosting device, do not allow battery voltage to exceed 16 volts. Refer to instructions provided with device being used.

Failure to follow these instructions may result in personal injury.

CAUTION:

When using another vehicle as a booster, do not allow vehicles to touch. Electrical systems can be damaged on either vehicle.


TO JUMP START A DISABLED VEHICLE:

  1. Raise hood on disabled vehicle and visually inspect engine compartment for:

    • Generator drive belt condition and tension.
    • Fuel fumes or leakage, correct if necessary.
    • Frozen battery.
    • Yellow or bright color test indicator, if equipped.
    • Low battery fluid level.

    CAUTION:

    If the cause of starting problem on disabled vehicle is severe, damage to booster vehicle charging system can result.


    2.  
  2. When using another vehicle as a booster source, turn off all accessories, place gear selector in park or neutral, set park brake or equivalent and operate engine at 1200 rpm.

    3.  
  3. On disabled vehicle, place gear selector in park or neutral and set park brake or equivalent. Turn OFF all accessories.

    4.  
  4. Connect jumper cables to booster battery. RED clamp to positive terminal (+). BLACK clamp to negative terminal (-). DO NOT allow clamps at opposite end of cables to touch, electrical arc will result. Review all warnings in this procedure.

    5.  
  5. On disabled vehicle, connect RED jumper cable clamp to battery positive (+) terminal. Connect BLACK jumper cable clamp to the engine as close to the ground cable connection as possible.

    CAUTION:

    Do not crank starter motor on disabled vehicle for more than 15 seconds, starter will overheat and could fail.


    6.  
  6. Allow battery in disabled vehicle to charge to at least 12.4 volts (75% charge) before attempting to start engine. If engine does not start within 15 seconds, stop cranking engine and allow starter to cool (15 min.), before cranking again.

    7.  

DISCONNECT CABLE CLAMPS AS FOLLOWS: