GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Transmission/Transaxle 🢒 Manual Transmission - Medium Duty 🢒 Backup Lamp Switch Replacement

Removal Procedure

    Object Number: 790997 Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. If equipped with the Eaton® Fuller® RT6609 9 speed transmission, disconnect the backup lamp switch electrical connector (2).

    3. Object Number: 791220 Size: SH
  3. If equipped with the Spicer® ES52-7B or ES066-7B 7 speed transmissions, disconnect the backup lamp switch electrical connector (2).

    4. Object Number: 791222 Size: SH
  4. If equipped with the Eaton® Fuller® RT8709 9 speed, or RT8908LL 10 speed transmissions, disconnect the backup lamp switch electrical connector (1).

    5. Object Number: 791223 Size: SH
  5. If equipped with one of the following Eaton® Fuller® transmissions, disconnect the backup lamp switch electrical connector (1, 2).
    6. • 5 speed:
       - FS-4205A/B
       - FS-5205A/B
       - FS-6305A/B
    • 6 speed:
       - FS-5406A
       - FS-6406A
       - FSO-8406A

    Object Number: 791221 Size: SH
  6. If equipped with the Eaton® Fuller® FO 8406A-ASX transmission, disconnect the backup lamp switch electrical connector (1).
  7. Remove the backup lamp switch.

Installation Procedure

    Object Number: 791221 Size: SH

    Important: A NEW backup lamp switch has pre-applied thread sealant on the threads.

  1. If installing the old backup lamp switch, apply thread sealant GM P/N 12346004 or equivalent to the threads.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the backup lamp switch.

    3. Tighten
    Tighten the backup lamp switch to 48 N·m (35 lb ft).

  3. If equipped with the Eaton® Fuller® FO 8406A-ASX transmission, connect the backup lamp switch electrical connector (1).

    4. Object Number: 791223 Size: SH
  4. If equipped with one of the following Eaton® Fuller® transmissions, connect the backup lamp switch electrical connector (1, 2).
    5. • 5 speed:
       - FS-4205A/B
       - FS-5205A/B
       - FS-6305A/B
    • 6 speed:
       - FS-5406A
       - FS-6406A
       - FSO-8406A

    Object Number: 791222 Size: SH
  5. If equipped with the Eaton® Fuller® RT8709 9 speed, or RT8908LL 10 speed transmissions, connect the backup lamp switch electrical connector (1).

    6. Object Number: 791220 Size: SH
  6. If equipped with the Spicer® ES52-7B or ES066-7B 7 speed transmissions, connect the backup lamp switch electrical connector (2).

    7. Object Number: 790997 Size: SH
  7. If equipped with the Eaton® Fuller® RT6609 9 speed transmission, connect the backup lamp switch electrical connector (2).
  8. Lower the vehicle.