How do you hook up an ignition coil

Older-model cars used the volt ignition coils to provide power to the spark plugs. They usually required only three wires: the spark plug wire, the power wire and the ignition switch wire. Connect one end of the spark plug wire to the large center terminal of the ignition coil.
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If your car uses a 12 volt battery, the 12 volts you put into the primary side of the coil will exit the secondary side as 30, volts!


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The high voltage is carried away from the coil by a high-tension cable that looks like a short piece of spark plug cable and runs to the distributor tower. With a one-cylinder engine, you could run the coil straight to the spark plug, but in a multi-cylinder engine, you need a distributor to route the high-voltage secondary current to fire each spark plug at a specific time.


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Positive ground is the reverse. Failures and Fixes Most ignition coils are long lasting and reliable, but a weak coil you can be the cause of under-hood havoc.

Your Answer

You cannot operate a car smoothly without delivering high voltage to the spark plugs to ignite the air-fuel mixture. Most coil failures result from secondary winding defects.

Ignition Coil - Circuit Confusion

Sometimes the thin lacquer insulation between the two windings deteriorates. Other times the windings are no longer insulated from ground.


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  • How do you wire an ignition coil to a distributor? | HowStuffWorks.
  • About Ignition Coils.
  • Ignition Coil Basics.
  • These kinds of coil problems are usually caused by heat and vibration. It is possible to have a sudden failure due to broken windings or bad connections inside the coil. These coils have one large terminal for the spark plug wire that runs over to the distributor and two small terminals that supply power to the coil.

    Ignition Coils

    Connect one end of the spark plug wire to the large center terminal of the ignition coil. Connect the other end of that wire to the center terminal of the distributor cap. Connect the positive terminal of the ignition coil to the "On" terminal of the ignition switch. Connect the negative terminal of the ignition coil to the coil terminal of the distributor.

    About Ignition Coils

    William Kinsey lives in Concord, N. The breaker points are also responsible for the spark's timing. The timing is critical to proper engine performance. Usually there's a short delay between the time that the spark goes off and the time that the fuel and air mixture in the cylinder reaches its maximum pressure.

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    The spark has to happen before the piston makes it to the top of its compression stroke so that the there's enough pressure in the cylinder for the spark to be effective. If the spark happened when the piston was at the top of its stroke, by the time it reached the mixture the piston would already be on its way back down and the maximum pressure would be lost. How Automobile Ignition Systems Work.