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How-to-guides - Resistors


Understanding resistors and color code table




The resistor is used now more than ever on many vehicles using data bus communications. Understanding what they do and how they work will make your next installation easier than ever.
















A resistor is a device which limits the flow of electricity in a circuit.  Resistors are available in many shapes, sizes and types. The type commonly used in vehicle security applications is the fixed-value carbon film resistor. The resistors use colored bands to designate their value in ohms and tolerance.  An ohm is the unit of measurement which denotes

how much resistance is applied, higher numbers being more resistance and lower numbers being less. Tolerance is a percent value indicating the range, plus or minus; of the stated ohm value versus what is actually present.  Resistors are also rated by watts, which is the amount of power (voltage x amps) the resistor can handle.  If the watt rating is exceeded, the resistor will overheat and burn up.

Resistor value calculator



More about resistor


The value of the resistor above is 2700 ohm, which can be abbreviated by using the letter “k” to represent three of the digits and the Greek letter “Omega” in place of the word “ohm”.

  • Abbreviated, the value would appear as “2.7O”. The Gold 4th band denotes that this resistor will be within 5%, plus or minus, of that value.  Hence, the actual metered value of this example will be between a low of 2565 ohms or a high 2835 ohms. 

  • Resistors are non-polarized, which means the orientation or direction of the resistor in a circuit is not a consideration.



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