CHEVROLET LUMINA 2007MY BRM
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Body
Wiring Systems 8-1154
Fuse Types
Current Rating Amperes
Color
Auto Fuses, Mini Fuses
2
Gray
3
Violet
5
Tan
7.5
Brown
10
Red
15
Blue
20
Yellow
25
White or Natural
30
Green
Maxi Fuses
20
Yellow
30
Light Green
40
Orange or Amber
60
Blue
50
Red
Circuit Protection - 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 Coefcient (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.
Circuit Protection - 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 centre. Use a continuity tester or a Digital Multimeter 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 gauge size.
Wiring Repairs
Except for some specic connector bodies, wiring harness terminals, terminal seals and connector bodies are generally
not serviced individually.
Specic terminals, with seals (if tted) are serviced only as an assembly with a wiring pigtail attached. Refer to Parts
Information for a listing of serviced terminals and connector bodies.
When conducting wiring harness repairs that involve replacement of damaged terminal(s), remove the terminal(s) from
the connector body (refer to instructions in this Volume) and splice new terminal(s) with wiring pigtail into the wiring
harness (refer to instructions in this Volume).