Sierra Classic 1500 2WD V8-4.8L (2007)
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IMPORTANT:
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Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC.
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Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact.
4. Strip the insulation.
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Select the correct size opening in the wire stripper or work down from the largest size.
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Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1).
5. Select the proper duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table.
6. Place the duraseal splice sleeve in the J-38125-8 (GM P/N 12085115) crimp tool nest so that the crimp falls at point 1 on the splice.
7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest.
8. Insert the wires into the duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to
prevent the wire from passing through the splice (3).
9. Close the handles of the J-38125-8 (GM P/N 12085115), until the crimper handles open when released. The crimper handles will not open until
the proper amount of pressure is applied to the splice sleeve.
10. Shrink the insulation around the splice.
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Using the heat torch, apply heat to the crimped area of the barrel.
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Gradually move the heat barrel to the open end of the tubing.
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The tubing will shrink completely as the heat is moved along the insulation.
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A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved.
Splicing Inline Harness Diodes
SPLICING INLINE HARNESS DIODES
Many vehicle electrical systems use a diode to isolate circuits and protect the components from voltage spikes. When installing a new diode use the
following procedure.
1. Open the harness.
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If the harness is taped, remove the tape.
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To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness.
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If the harness has a black plastic conduit, pull out the diode.
2. If the diode is taped to the harness, remove all of the tape.
3. Check and record the current flow direction and orientation of diode.
4. Remove the inoperative diode from the harness with a suitable soldering tool.
IMPORTANT: If the diode is located next to a connector terminal remove the terminal(s) from the connector to prevent damage from the soldering
tool.
5. Carefully strip away a section of insulation next to the old soldered portion of the wire(s). Do not remove any more than is needed to attach the
new diode.
6. Check current flow direction of the new diode, being sure to install the diode with correct bias. Reference the appropriate service data wiring
schematic to obtain the correct diode installation position.
7. Attach the new diode to the wire(s) using 60/40 rosin core solder. Before soldering attach some heat sinks (aluminum alligator clips) across the
diode wire ends to protect the diode from excessive heat. Follow the manufacturer's instruction for the soldering equipment.
8. Reinstall terminal(s) into the connector body if previously removed.
9. IMPORTANT: To prevent shorts to ground and water intrusion, completely cover all exposed wire and diode attachment points with tape.
Tape the diode to the harness or connector using electrical tape.
Splicing Twisted or Shielded Cable
SPLICING TWISTED OR SHIELDED CABLE
Twisted/shielded cable is used in order to protect wiring from electrical noise. Two-conductor cable of this construction is used between the radio and
the Delco-Bose(R) speaker/amplifier units and other applications where low level, sensitive signals must be carried. Follow the instructions below in
order to repair the twisted/shielded cable.