CAR ALARM AND REMOTE START INSTALLATION GUIDE
Copyrght 2002-2004 Triple S Customs
32
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
INTRODUCTION TO RELAYS;
•
A relay is nothing more than a switch. A relay is an electrmechanical switch. Simply put, a relay will be used
for an alarm or remote start installation for one or more of the four purposes:
o
To turn something ON
o
To turn something OFF or disable something
o
To change the polarity of a wire
o
To increase the current supply of a wire.
•
Relays involve the simple matter of switching. The difference between a switch that you turn on or off with
your finger and a relay is the method of activation. You use your finger to turn a switch on or off, but a relay is
activated electronically. This is how a car alarm or remote start system’s functions can operate without having
someone to turn a switch manually.
•
Relays are often used in alarm or remote start installations to control functions like:
o
Starter interrupts or disables
o
Power door locks
o
Flashing parking lights
o
Power trunk, power hatch, or power fuel door releases
o
Horn
honk
o
Multiple
triggers
o
Garage
door
openers
o
Power window/sunroof control
Example of a Bosch SPDT 30-amp relay:
