INTRODUCTION TO RESISTORS
Copyright 2002-2004 Triple S Customs
INTRO TO RESISTORS:
" A resistor is an electrical component designed to have a specific resistance (or opposition) to the flow of electrons, measured in ohms
(&!).
" When installing a remote start or security system, resistors of a specific resistance may be needed to interface with the vehicle s circuits.
Some of a vehicle s circuits may require a reduced voltage to operate a specific accessory or function. A resistor can be added to reduce
the trigger voltage to the circuit. Resistors will not be required on most installations, but will be required for installations on many newer
vehicles. For example, on a 2002 Dodge Intrepid, a positive pulse through a 2700-Ohm resistor to the door lock wire will lock the doors.
If resistors are not included with the system you purchased, they can be found at almost any electronics parts store such as Radio
Shack.
" Carbon-film resistors are the type most commonly used in vehicle security and convenience applications. Color bands on the resistor will
indicate the value in ohms as well as its tolerance in a plus or minus percentage of accuracy. Resistors also have a watt rating to indicate
the amount of power it can handle. If you exceed the power rating of a resistor, it will overheat and burn.
Symbol used in wiring schematics to indicate a resistor:
RESISTOR COLOR CODES
RESISTOR COLOR CODES
COLOR SIGNIFICANT MULTIPLIER TOLERANCE FAILURE RATE (% of failure per 1000
FIGURES hours of operation)
BLACK 0 1 -
Ä… 20%
BROWN 1 10 1.0
Ä… 1%
RED 2 100 0.1
Ä… 2%
ORANGE 3 1,000 0.01
Ä… 3%
YELLOW 4 10,000 0.001
Ä… 4%
GREEN 5 100,000 - -
BLUE 6 1,000,000 - -
VIOLET 7 10,000,000 - -
GRAY 8 100,000,000 - -
WHITE 9 9 Solderable
GOLD - .01 -
Ä… 5%
SILVER - 0.01 -
Ä… 10%
NO COLOR - -
Ä… 20%
EXAMPLE:
If the 1st band is ORANGE and the 2nd band is GREEN and the 3rd band is RED and the 4th band is GOLD then:
ORANGE 1st band=3, GREEN 2nd band=5, RED 3rd band=100, GOLD 4th band=5% so:
35X100=3500 RESISTOR VALUE IS 3500 OHMS WITH A TOLERANCE OF 5%.
TROUBLESHOOTING RESISTORS:
TROUBLESHOOTING RESISTORS:
Troubleshooting resistors is pretty straightforward. Resistors almost always open when they go bad. An open resistor in a series circuit will
stop current from flowing in the circuit. An open resistor in a parallel circuit will increase the resistance and decrease the total current.
Copyright 2002-2004 Triple S Customs
2
RESISTOR VALUE COLOR BANDS
249 OHMS RED YELLOW WHITE BLACK BROWN
330 OHMS ORANGE ORANGE BROWN GOLD
365 OHMS ORANGE BLUE GREEN BLACK BROWN
390 OHMS ORANGE WHITE BROWN GOLD
430 OHMS YELLOW ORANGE BROWN GOLD
470 OHMS YELLOW VIOLET BROWN GOLD
487 OHMS YELLOW GRAY VIOLET BLACK BROWN
560 OHMS GREEN BLUE BROWN GOLD
620 OHMS BLUE RED BLACK BLACK BROWN
665 OHMS BLUE BLUE GREEN BLACK BROWN
750 OHMS VIOLET GREEN BROWN GOLD
820 OHMS GRAY RED BROWN GOLD
867 OHMS GRAY BLUE VIOLET BLACK BROWN
931 OHMS WHITE ORANGE BROWN BLACK BROWN
1000 OHMS BROWN BLACK RED GOLD
1200 OHMS BROWN RED RED GOLD
1500 OHMS BROWN GREEN RED GOLD
1870 OHMS BROWN GRAY VIOLET BROWN BROWN
2000 OHMS RED BLACK RED GOLD
2700 OHMS RED VIOLET BLACK BROWN BROWN
3000 OHMS ORANGE BLACK RED GOLD
4020 OHMS YELLOW BLACK RED BROWN BROWN
4700 OHMS YELLOW VIOLET RED GOLD
5360 OHMS GREEN ORANGE BLUE BROWN BROWN
7150 OHMS VIOLET BROWN GREEN BROWN BROWN
7500 OHMS VIOLET GREEN RED GOLD
9100 OHMS WHITE BROWN RED GOLD
In some cases, you ll need a resistor of a value other than what you have available. Different resistance values can be obtained by combining
the resistors in a series or parallel connection.
SERIES CONNECTION
When two or more resistors are wired in series, the total value is the sum of the resistor values.
R1 + R2 = Total resistance value
PARALLEL CONNECTION
When two or more resistors are wired in parallel, the total value is the total of the value of the first resistor multiplied by the second resistor
divided by the sum of the first resistor and the second resistor.
(R1 X R2) ÷ (R1 + R2) = Total resistance value
Copyright 2002-2004 Triple S Customs
3
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