Molly Ayala
Electric chokes are a common feature on many cars, and knowing how to hook one up is an essential skill for any enthusiast or professional mechanic. While the process may seem daunting at first, with the right knowledge and tools, it can be a straightforward task. Electric chokes require a power source to function, and it is crucial to ensure that this is set up correctly to avoid issues such as poor spark, bad gas mileage, or even engine damage. In this discussion, we will delve into the intricacies of wiring an electric choke, covering topics such as voltage requirements, power sources, and the potential pitfalls to avoid, providing a comprehensive guide for anyone looking to tackle this project.
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What You'll Learn
Understanding the electric choke and its function
In the world of power electronics, electrical chokes are essential for smoothing voltage and current. They are also used to block higher-frequency alternating currents (AC) while passing direct current (DC) and lower-frequency AC in a circuit. The choke's impedance increases with frequency. Its low electrical resistance passes both AC and DC with minimal power loss, but its reactance limits the amount of AC that passes through.
The name "choke" comes from its function of "choking," or blocking, high frequencies while allowing low frequencies to pass. This is achieved through the use of an electrical component that consists of a coil of insulated wire, often wound around a magnetic core. Some chokes consist of a doughnut-shaped ferrite bead strung on a wire.
There are several different types of chokes available, each with its own unique properties and applications. For example, a common mode choke is used to suppress common-mode noise, which is noise present on both the signal and ground lines of a circuit. It is often used in power supplies and other high-voltage applications. A differential mode choke, on the other hand, is used to filter out differential mode noise, which is noise present on the signal line but not the ground line.
In addition to these, there are ferrite bead chokes, which are small, cylindrical chokes that block high-frequency noise and are often used in computer and audio cables to reduce electromagnetic interference. Surface mount devices (SMDs) are used as chokes in electronic circuits to remove noise and interference, commonly in audio and video equipment.
Understanding the function and various types of electric chokes is crucial for effective wiring and utilisation in specific applications, such as in vintage cars or power electronics.
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Wiring basics and necessary tools
Wiring an electric choke requires a basic understanding of electrical circuits and some specialised tools. The process involves connecting the choke to a power source, typically a 12-volt source, and ensuring that it only receives power when the engine is running to prevent overheating.
The necessary tools for this task include:
- Wire cutters or a knife: To strip insulation from wires and, if necessary, cut wires to the correct length.
- Electrical tape or wire connectors: To insulate exposed wire and create secure connections.
- Voltmeter or multimeter: To test voltage levels and ensure the circuit is functioning correctly.
- Wrenches and screwdrivers: For tightening connections and working with electrical components.
Basic wiring knowledge is essential for this task. Understanding electrical circuits, voltage, and current flow is crucial to ensuring a safe and functional installation. It is also important to identify the correct wires to connect to, as incorrect connections can lead to improper choke function, poor gas mileage, and even engine damage.
Before beginning any wiring work, it is important to review the specific instructions for your electric choke and vehicle. Different vehicles and choke designs may have unique requirements or steps, and it is crucial to follow the manufacturer's guidelines to ensure a safe and proper installation.
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Step-by-step choke installation guide
Before beginning the installation, ensure you have the correct electric choke for your carburettor and engine setup. Refer to the manufacturer's instructions for specific details, as chokes can vary slightly between brands.
First, locate the choke coil. This is usually positioned near the carburettor, often on the passenger side of the vehicle's firewall. You will need to mount the choke coil in a secure position, ensuring it is not exposed to excessive heat or moisture. The coil should be close to the carburettor, with the wiring harness reaching comfortably.
Next, connect the wiring. The choke coil will have two wires, one for power and one for ground. Connect the power wire (usually red) to the ignition coil's power source, which could be the 'IGN' terminal on the ignition coil. This wire should be fused and provide power only when the ignition is on. The ground wire (usually black) should be connected to a good engine ground. Ensure these connections are secure and soldered, if possible, for a reliable connection.
Now, attach the choke pull-off. This is a small, cylindrical device that activates the choke when the engine is cold. It should be mounted on the carburettor, with the rod or cable connecting to the choke plate. Refer to the carburettor's instructions for the exact location and method of attachment.
Finally, adjust the choke as needed. With the engine running and warmed up, adjust the choke's sensitivity and activation point to ensure it operates smoothly and effectively. This may require fine-tuning over a few engine heat cycles to get the perfect setting.
Always ensure the vehicle's electrical system is turned off before beginning any installation work, and refer to specific manufacturer instructions where possible.
A correctly installed electric choke will ensure reliable cold-start performance and a smooth-running engine.
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Common issues and troubleshooting
Electric chokes are designed to manage the air-fuel mixture when the engine is cold. They are usually attached to the carburetor and can be identified by their cylindrical shape and electrical connector. When hooking up an electric choke, it is important to follow the recommended instructions to avoid issues. Here are some common problems and troubleshooting tips:
Loose or Dirty Connections: A common issue with electric chokes is a loose or dirty electrical connection. This can cause the choke to malfunction. To fix this, disconnect the choke and clean the connector with an electrical contact cleaner. Then, reconnect it, ensuring a snug fit.
Improper Adjustment: If the electric choke is not adjusted correctly, it may not function properly. To adjust it, hold the throttle open and turn the thermostat to close the choke valve. Give it a slight additional turn (about 1/8") to preload it. Without starting the engine, turn the key to the "on" position, and the choke should slowly start to open.
Voltage and Power Source Issues: The power source for the electric choke should be carefully considered. Avoid connecting it directly to the coil or ignition, as this can lead to improper functioning, poor gas mileage, and potential misfires. Instead, connect it to a switched 12V source, such as the S terminal of the alternator. This ensures that the choke only receives voltage when the engine is running.
Inadequate Voltage Output: The stator might not output enough voltage to fully heat the coil inside the choke cap. In this case, consider running a relay off the starter solenoid and battery to achieve a full 12V supply.
Confusing Aftermarket Instructions: Generic aftermarket instructions may suggest connecting to a switched 12V source, which can be confusing. For the electric choke to function as intended, connect it to the stator output of the alternator (the stator lug). This is because the stator lug provides the correct connection for the electric choke to operate as designed.
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Testing and safety procedures
Testing the Electric Choke Mechanism:
- Start with a cold engine and remove the air cleaner assembly.
- Slightly open the throttle and observe the upper butterfly valve for the choke. If it doesn't snap closed, the choke is either misadjusted or broken.
- Turn the car to the "run" position without starting it.
- Use a meter or test light to check for power in the green wire connected to the choke assembly. If there's no power, investigate the cause.
- If power is present, observe the upper choke plate. It should gradually open and be fully extended within a few minutes. If it doesn't open, the choke may be broken or misadjusted. If it opens too quickly or slowly, adjust the choke accordingly.
- To adjust the choke's opening rate, turn the choke body cover where the green wire connects. Clockwise rotation will likely slow down the opening, while counter-clockwise will speed it up.
- Loosen the Phillips head screws to rotate the cover, but only enough to allow rotation without fully removing them.
- For further testing, remove the choke cover and disconnect the wire. Test its functionality by running hot and cold water over the cover. It should expand with hot water and retract with cold water.
- Alternatively, hold a lit match close to or touching the spring. Observe if the bi-metal switch trips, causing the light to turn on and current to flow through the switch.
Safety Procedures:
- Avoid connecting the electric choke to the coil or ignition as the power source. This can lead to improper choke function, poor fuel efficiency, and potential misfires.
- Ensure the choke is connected to a switched 12V source. This prevents the choke from constantly receiving power and draining the battery.
- The recommended connection point for the electric choke is the stator output of the alternator (stator lug). This ensures the choke functions as designed and avoids coil issues due to voltage drops.
- If using a carburetor, some models may require a full 12V supply, which can be achieved by running a relay off the starter solenoid and battery.
By following these testing and safety procedures, you can ensure that your electric choke is properly configured and functioning as intended, preventing potential issues with your engine's performance.
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Frequently asked questions
A full 12V is required for an electric choke to function properly.
The stator lug on the alternator is the correct connection for an electric choke to work as designed.
The best place to connect an electric choke is on the S terminal of the alternator. This way, the choke only receives voltage when the engine is running.
The electric choke has two wiring connections, one positive and one negative. The negative lead should go to any good engine ground, and the positive lead should go to any circuit that is hot only when the engine is running.
The stator will not output enough voltage to fully heat the coil inside the choke cap. You will need to run a relay off the starter solenoid and battery to get a full 12V.
