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Wiring topper light access hole for wires in bed?

Jim larson1

By Jim larson1
in Troubleshooting & Recalls

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Jim larson1 New Member

Jim larson1

Posted
Posted

Just getting around to running wires from underneath the car up to inside ARE topper.  I have wires up inside the tail light housing.  Just need to know how to get them to the inside of the bed so I can then connect to wires from 3rd brake/dome light.

 

is there a access hole or do I have to drill one?  Thanks

newdude Senior Enthusiast

newdude

Posted
Posted

GM has a designated terminal in the cargo lamp connector on the frame.  The center high mount lamps are known to leak on these trucks, so if you can avoid it, I'd use the wired circuits GM has.  

 

Quote

 

#PIT5314C: CHMSL Wiring for Aftermarket Bed Cap Topper

2016-2019 model years

Perform the following recommendations based on vehicle configuration:

  1. For vehicles built WITH Under Rail Bed Lighting Option:

    Trucks equipped with the under rail bed lighting option will already have the female side of the X400 connector.  Obtain an appropriate length of 18 ga wire to run from the X400 connector up to the CHMSL wiring for the cap or topper.  Use terminal part # 60012931 in AFL Tray 21, along with wire seal  part # 60994015 in AFL Tray 21 and connect it to one end of the wire.  Disconnect the X400 connector and remove the rubber cavity plug in pin position 4 and discard.  Install the terminated lead that was just made into the X400 connector pin 4.  Run the wire up to the CHMSL for the cap or topper and connect.  The ground for the cap or topper CHMSL will need to be made to an appropriate ground.

  2. For vehicles built WITHOUT Under Rail Bed Lighting Option:

    Trucks not equipped with the under rail bed lighting option will have a dummy X400 female connector, which will be removed and discarded.  The female side of the X400 connector is not available separately, but can be obtained by ordering the under rail bed lighting harness GM part number 23327843.  The harness will come with terminals/wiring in pin positions 1 and 6.  Remove the wiring and terminal from pin location 1 and discard.  Move the rubber cavity plug from pin position 4 and reinstall it into pin position 1.  Obtain an appropriate length of 18 ga wire to run from the X400 up to the CHMSL wiring for the cap or topper.  Use terminal part # 60012931 in AFL Tray 21, along with wire seal part #  60994015 in AFL Tray 21 and connect it to one end of the wire.  Install the terminated lead that was just made into the X400 connector pin location 4.  Pin 6 is a ground circuit that is used for the under rail bed lighting and it can also be used to ground the CHMSL for the cap or topper if the wire gauge size in the connector is of the proper size for the CHMSL in the cap or topper.  If the wire gauge size is too small, any of the following can be done:

  • Make a second wire as described above.  Then, remove the wiring from pin 6 and discard.  Install the new terminated wire in position 6 for the ground and run it up to the CHMSL for the cap or topper and connect.
  • Remove the wire and terminal from pin 6 and install a rubber cavity plug.
  • Cut the wire for terminal 6, leaving a couple inches of wire, and seal the end of the wire.

Note: The terminal removal tool for the female side of the X400 connector is J-38125-212.

2014-2015 model years

Perform the following recommendations based on vehicle configuration:

  1.  For vehicles built WITH Under Rail Bed Lighting Option:

    Trucks equipped with the under rail bed lighting option will already have an X6 connector at the rear body junction block X63A, which will be removed and discarded.   Obtain an appropriate length of 14 ga wire to run from the rear body junction block up to the CHMSL wiring for the cap or topper.  Use terminal part # 1-968857-3 in Lear Tray 7, along with wire seal  part # 828905-1 in Lear Tray 16 and connect to one end of the wire.  Disconnect the X6 connector at the Rear Body Junction Block and remove the rubber cavity plug in terminal position 1 and discard. Install the terminated lead you just made into the X6 connector terminal 1.  Run the wire up to the CHMSL for the cap or topper and connect.  The ground for the cap or topper CHMSL will need to be made to an appropriate ground.

  2. For vehicles built WITHOUT Under Rail Bed Lighting Option:

    Trucks not equipped with the under rail bed lighting option will have a dummy connector at the X6 position of the rear body junction block. The X6 connector body is not available separately, but can be obtained by ordering the under rail bed lighting harness GM part number 22878806. The harness will come with terminals/wiring in positions 4 and 7. You will need to remove the wiring from terminal 4 and discard. Move the rubber cavity plug from terminal position 1 into terminal position 4.  Obtain an appropriate length of 14 ga wire to run from the rear body junction block up to the CHMSL wiring for the cap or topper.  Use terminal part # 1-968857-3 in Lear Tray 7, along with wire seal  part # 828905-1 in Lear Tray 16  and connect to one end of the wire. Install the terminated lead you just made into the X6 connector terminal 1. Terminal 7 is a ground circuit used for the under rail bed lighting and it can be used to ground the CHMSL for the cap or topper, if desired.  If terminal 7 is not used remove the terminal and install a rubber cavity plug or cut off the additional wiring, leaving a couple inches of wire and seal the end of the wire.

 

  1.  

Jim larson1 New Member

Jim larson1

Posted
  • Author
Posted

That’s the circuit I am using.  Wire is strung from that connector for th3rd brake light into the area behind the tail light.  I just need to know how to get it up and through the box to the interior of the pickup bed?

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