K Tahoe 4WD V8-5.3L VIN T (2002)
Fuse Types Part 1
Fuse Types Part 2
The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a
circuit the fusible element will melt and create an open or incomplete circuit. Fuses are an one time protection device and must be replaced each time the
circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for an open (break). If not broken,
also check for continuity using a DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal current
rating.
Circuit Breakers
A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short
or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit
breakers are used.
Circuit Breaker: This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause
of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high
current is removed.
Positive Temperature Coefficient (PTC) Circuit Breaker: This type greatly increases its resistance when excessive current passes through it. The
excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively
open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the
voltage is removed the circuit breaker will re-close within a second or 2.
Fusible Links
Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or
electrical center. Use a continuity tester or a DMM at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it
must be replaced with fusible link of the same gage size.
Repairing a Fusible Link
IMPORTANT: Fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection.
General Information
The Connector Repairs contains the following types of connector repair information. Using these elements together will make connector repair faster and
easier:
-
Connector Position Assurance Locks
-
Terminal Position Assurance Locks
-
Push to Seat Connectors
-
Pull to Seat Connectors
-
Weather Pack Connectors
-
Repairing Connector Terminals
Connector Position Assurance Locks
The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of all the SIR system electrical connectors. The CPA
ensures that the connector halves cannot vibrate apart. You must have the CPA in place in order to ensure good contact between the SIR mating
terminals.
Pull to Seat Connectors
TERMINAL REMOVAL
Follow the steps below in order to repair pull-to-seat connectors.
