S10/T10 Blazer 4WD V6-4.3L VIN W (1997)
Single Wire Feed Fusible Link
To replace a damaged fusible link, cut it off beyond the splice. Replace with a repair link. When connecting the repair link, strip wire and use
staking-type pliers to crimp the splice securely in two places. For more details on splicing procedures, refer to "Typical Electrical Repair Procedures."
Use crimp and seal splices whenever possible. See: Wire Repair Procedures/Typical Electrical Repair Procedures
Double Wire Feed Fusible Link
To replace a damaged fusible link which feeds two harness wires, cut them both off beyond the splice. Use two repair links, one spliced to each harness
wire.
General Information
The purpose of circuit protection is to protect the wiring assembly during normal and overload conditions. An overload is defined as a current
requirement that is higher than normal. This overload could be caused by a short circuit or system malfunction. The short circuit could be the result of a
pinched or cut wire or an internal device short circuit, such as an electronic module failure.
The circuit protection device is only applied to protect the wiring assembly, and not the electrical load at the end of the assembly. For example, if an
electronic component short circuits, the circuit protection device will assure a minimal amount of damage to the wiring assembly. However, it will not
necessarily prevent damage to the component.
There are three basic types of circuit protection devices: Circuit Breaker, Fuse and Fusible Link.
Complete Harness
In many cases repairs can be made by ordering pigtail assemblies (prewired connectors) rather than the entire wiring harness. Only order complete
harness when there is major damage to the wiring harness. Always repair minor damage. Complete harness and pigtail part numbers can be found in the
GMSPO Carline Parts Catalog.
Gmspo Carline Parts Catalog
The GMSPO Carline parts Catalog, Group 2.535 contains connector repair kits with terminals and leads.
Gmspo Standard Parts Catalog
Check the GMSPO Standard Parts Catalog, Group 8.965. Fuses, circuit breakers, connectors, terminals, conduit, pigtail kits, and seals are listed in that
group.
Diode Replacement
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:
Step 1: Open the Harness
If the diode is taped to the harness, remove all of the tape.
Step 2: Remove inoperative Diode