A switch is a device used to turn something on or off. In a modern car, they are most often used to apply 12 volts (+) of
power to an electronic device, however they can also be used to apply a ground (-) to a circuit. Switches can range from relatively
simple devices to extremely complex. The simple automotive switch requires a push or a twist to turn something on and off. The push
or twist provides a mechanical input that allows the switch to alternate electrical contact points. So at rest, a switch may have
contact between wire one and wire two, but with a push or twist from a user, wire two will now be in contact with wire three,
leaving wire two disconnected from the system. Often times a simple switch is used to make the decision easy for the user, but
then relays are used to execute the complex electrical connections necessary to make it happen. For a good explanation of how
complex electrical switches work, take a look at our shopping guide article on
.
What is a Simple Switch?
The simple
automotive switches are the ones that you use most frequently; the
ignition switch, the headlight switch, the fog
light switch, the turn signal switch, the power door lock switch, the
power window switch and the
dimmer switch. They allow you to
easily turn things on and off, but for that reason they are the first switches to fail and often require replacement. When a switch
fails, trouble shooting the problem can often be time consuming. Most people would check the inline
fuses and relays first, as they
are much more likely to be the culprit behind electrical issues. In fact, a faulty switch can cause fuses and
relays to prematurely
blow, compounding the issue and making troubleshooting it even more difficult. Sometimes the best way to troubleshoot a switch is to
bench test it. To bench test a switch, you need to have a good understanding of how electrical circuit's works, so if you're not
qualified to do a bench test, seek the help of a professional.
How to Replace an Automotive Switch
Some switches are easy to replace while other require a considerable amount of work. Switches that are located on the dashboard
or center console are usually easy to replace because the switches can pop out of the dash and then be unplugged from the circuit.
If you already have a replacement switch, all you have to do is plug the new one in and press it back into the dash. Common switches
to find on your dashboard are the dimmer switch, the fog light switch and the
hazard flasher switch. Some switches can be quite tough to replace, particularly
ignition switches, but the windshield
wiper blade switch and headlight switch can also be tricky to swap out. All of these switches are found on or around your steering wheel and often require some disassembly before the switch can be replaced. Not impossible to do, especially if you have a manual to consult and guide you through the process.
Common Automotive Switch Components
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