Added: Devonta Ketter - Date: 01.11.2021 00:24 - Views: 44060 - Clicks: 6514
No matter what year vehicle you work on, everything in these two chapters is applicable. Included here are the ignition switch, the wiring harness itself, controllers, and protection. I like to think of the ignition switch as the gatekeeper.
The ignition switch is simply the key to it all!
The position of the switch determines the status and operation of most every accessory in the vehicle. These are the switch positions:. The ignition switch of my Ford Mustang GT functions similar to those on most older cars. Turn the switch back toward the driver to select the accessory position. These are the high-current connections from the ignition switch in the same vehicle. I removed the protective cover for this shot. As you would expect, the other side of the switch has many large-gauge wires connected to it. These are Ignition switch hook up input and outputs, and here are their functions:.
Many vehicles on the road today have two or more outputs for each of the above due to the sheer of circuits in these vehicles and their total current requirements. In addition, some vehicles may have multiple inputs for the switch as a result of these current requirements. There is a very simple reason why the switch works the way it does. Well, we should first Ignition switch hook up when we want the tach to operate. No matter how complex or simple it is, its function is to connect the various electronic components to their associated controllers so that everything works in harmony.
As vehicle technology and the features within them has increased over the years, so has the complexity and size of the wiring harness. This has always been a concern of automakers because it adds weight and generally speaking, weight has a negative impact on fuel economy.
Early on, automakers made the decision to halve that weight by using the chassis of the vehicle as a common point for all things negative.
This is typically referred to as the return path. This philosophy has presented its fair share of challenges for vehicle deers, engineers, and anyone adding aftermarket electronics! Here are just a few such challenges:. Rest assured the engineers Ignition switch hook up the electronics on-board the modern vehicle have taken both of the above into consideration so they have high immunity to such noise.
There is simply no substitute for experience in these cases. Since the beginning of auto manufacturing, automakers have gone out of their way to keep the wiring out of sight of the occupants. So, where is it all? Ignition switch hook up bulk of it has always been behind the dashboard. Runs from there to the following are common:.
Again, as the of on-board electronic features increases, so does the complexity of the wiring harness. Some harnesses are yellow, others orange, and others red or green. This varies by vehicle, but assume these brightly colored harnesses and plugs are verboten! Take note of the bright yellow plugs on the right. Leave this to the pros! If your hot rod is a late model one, then you may want to consider purchasing a shop manual that has a diagram of the wiring harness. You can buy a consumer manual at your local auto parts store from Haynes or Chilton that has the basics.
You should also check with your local library because many of them have quite a selection of these on the shelf. A more advanced manual can sometimes be purchased directly from the manufacturer. When I was in the shop, we relied on manuals from Mitchell, and they were extremely accurate. OK, now that you know about the ignition switch and the wiring harness, you should understand their roles.
As I said earlier, I consider the ignition switch to be the gatekeeper. A controller is considered anything that controls or governs the operation of an accessory—be it a simple switch or an on-board computer. Switches are the simplest of all controllers.
Most are manual, meaning that the operator of the vehicle has to operate them manually, such as a turn al switch. Switches are typically used to control low- to medium-current accessories. Higher current switches are sometimes used for high-powered accessories, such as headlights or fog lights. When using a switch of any kind, it Ignition switch hook up important to match its current rating to that of the accessory it is controlling—a little bigger is never a bad idea.
As its name implies, it has a single pole common and a single electrical path that can be thrown open or closed. These switches are available in toggles, pushbutton, momentary, and many other styles. In the on position, the switch allows current to flow from the pole to the accessory. In the off position, the switch interrupts the flow of current to the accessory.
These switches are easily identified, as they have only two electrical terminals. This switch is simple in concept, but incredibly versatile as it can be used in a great many arrangements. All of the switches here are of the S. This third terminal is simply a ground input for the light. It is built into the toggle itself that goes on when the switch is closed. Of special interest Ignition switch hook up the push-button switch on the right. Press the button once and the switch is thrown one way, press it again and the switch is thrown the other. In the center position, the C is not connected to anything.
In the up position, the C is connected to one of the N. A switch like this Figure is what automakers use to control the turn als. By adding a simple diode to the switch, the up position allows the parking lights only to be on, and the down position allows both the headlights and the parking lights to be on—clever. The rheostat is built into the light switch assembly, which is used to dim the dash lights in my Mustang.
Look closely for the white ceramic part with the spring nearby; this is the rheostat itself. Rheostats: A rheostat Figure is a switch that allows one to vary how much voltage is applied to an accessory. In addition, a rheostat is typically deed to allow the passage of a considerable amount of current.
The dimmer switch controller for your dash lights is one such example. A rheostat is really nothing more than a variable resistor. It has a wiper that rides along a carbon contact surface that has a varying level of resistance, which Ignition switch hook up linear by de. This allows the switch to have any voltage between 0 VDC and 12 VDC available at its output, based on where the dial is manually set. Current Ratings: Most switches have a specified current rating. This is the amount of current that the switch can safely pass through its contacts.
In fact, OEMs typically use a switch with a higher current rating than the load connected to it, so that the switch provides many years of service. In addition, this can be a fire hazard. As I said earlier, this is my absolute favorite switch. A relay Figure is simply an electromagnetic switch, so you already know what it does. The difference between a simple switch and a relay is how the switching is done.
Relays are available in all shapes and sizes. Shown are S. Unlocking the Mystery: OK, so why are relays typically regarded as black magic? Since you already know all about switches, the relay is simply an extension of that knowledge. No different than switches, relays are also available in many different variations. This means that a relay really has two electrically isolated parts:.Ignition switch hook up
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How to Wire an Ignition Switch