Tesla Model 3 Owners & Service Manuals

Tesla Model 3: Contactor - Negative - HV Battery- Install

Tesla Model 3 2017-2025 Service Manual / Battery System / HV Battery Electrical Components / Contactor - Negative - HV Battery (Remove and Replace) / Contactor - Negative - HV Battery- Install

Install

  1. Use an IPA wipe to clean the high voltage mating surfaces of the HV battery terminal, negative busbar, and the HV battery negative contactor.

Contactor - Negative - HV Battery- Install

  1. Install the HV battery negative contactor into the penthouse, and then install the nuts that attach the contactor into the penthouse. Torque 8 Nm

Contactor - Negative - HV Battery- Install

  1. Install a new nut to attach the HV battery negative contactor onto the HV battery terminal, and then mark the nut with a paint pen after it is torqued. Torque 9 Nm

Generic Measurement - Actual busbars and fasteners might appear different Generic Measurement - Actual busbars and fasteners might appear different

  1. Use the Hioki resistance meter to measure the resistance at the HV joint between the HV battery negative contactor and the HV battery terminal.

Note: The maximum acceptable resistance is 0.110 mΩ (110 μΩ). If the resistance is above this value, escalate a Toolbox session, as appropriate.

Contactor - Negative - HV Battery- Install

  1. Install a new bolt to attach the HV battery negative contactor onto the negative busbar, and then mark the bolt with a paint pen after it is torqued. Torque 9 Nm

Generic Measurement - Actual busbars and fasteners might appear different Generic Measurement - Actual busbars and fasteners might appear different

  1. Use the Hioki resistance meter to measure the resistance at the HV joint between the HV battery negative contactor and the negative busbar.

Note: The maximum acceptable resistance is 0.060 mΩ (60 μΩ). If the resistance is above this value, escalate a Toolbox session, as appropriate.

Contactor - Negative - HV Battery- Install

  1. Install the insulator caps to the HV battery negative contactor.

Contactor - Negative - HV Battery- Install

  1. Connect the electrical harness to the HV battery negative contactor connectors.

Contactor - Negative - HV Battery- Install

  1. Install the clip that attaches the HV battery penthouse harness to the HV battery fast charge contactor.
  2. Install the pyrotechnic battery disconnect into the penthouse. See Pyrotechnic Battery Disconnect (Remove and Replace).

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    SPECIAL TOOLS Ratchet, 1/4" Sq Dr, HV Insulated (1057602-00-A) Ext Bar, Wobble, 1/4" Dr, HV Insulated (1057603-00-A) Magnet, Flexible, HV Insulated, 18" (1057607-00-A) Socket, 1/4" Dr, Deep,10 mm,Th

     Contactor - Positive - HV Battery-Install

    Install Caution: Replace all patchbolts. Replace all nyloc nuts. Use an IPA wipe to clean the high voltage mating surfaces of the HV battery terminal, positive busbar, and the HV battery posit

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