Seville STS V8-4.6L VIN 9 (1998)
Use the J 35616-A Connector Test Adapter Kit in order to connect the DMM to the circuit.
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If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit
or for checking multiple circuits quickly.
Short Finder
The J 8681-A can locate hidden shorts to ground. The short finder creates a pulsing magnetic field in the shorted circuit and shows the location of the
short through the body trim or sheet metal.
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 two.
Fuses
Circuit Protection - Fuses
Fuse Types
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). It not broken,
also check for continuity using a J 39200 DMM or a continuity tester. If the element is open or continuity is suspect, replace the fuse with one of equal
current rating.
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 J 39200 DMM at each end of the wire containing the fusible link in order to determine if it is broken. If
