Readers ask: How Do You Tell If A Coil Is Good On Lawn Tractor?

How do I know if my lawnmower coil is bad?

Replace the original wire with the in-line spark tester, and attempt to start the motor. Watch for the same intensity of a spark that you saw when the mower was cold, If there is little or no spark, the ignition coil is bad and needs replacement.

How can you tell if an ignition coil is good?

The only safe way to test for spark is to use a spark plug tester tool. If a coil problem is suspected, measure the coil’s primary and secondary resistance with an ohmmeter. If either is out of specifications, the coil needs to be replaced. A coil can be easily bench tested with a digital 10 megaohm impedance ohmmeter.

What causes a lawn mower coil to fail?

Overheating. The operating temperature of the engine gets to hot and burns the coil out. This is not real common on a small engine as usually the engine will shut down from heat before the coil will fail, but it is possible. Resistance problems.

What causes no spark on lawn mower?

Ignition Module Failure When it does fail, it is usually due to heat caused from improper wiring of the ground wire to battery voltage. If the engine does not produce spark, other areas of the ignition system should be checked before focusing on the ignition module as source of failure (see above).

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How many ohms should a ignition coil have?

Most ignition coils should have a primary resistance falling somewhere between 0.4 and 2 ohms; however, refer to your manufacturer’s specifications for the correct reading. If a reading of zero is displayed, that signifies that the ignition coil has shorted internally in the primary windings and needs to be replaced.

What happens when ignition coil gets hot?

A damaged coil can short some windings, causing high current but low inductance, so low energy. As it gets hot the energy falloff weakens the spark until the engine quits making noises.

How long do ignition coils last?

The ignition coil on your car is supposed to last around 100,000 miles or more. There are a number of factors that can lead to this part become damaged prematurely. Most of the newer cars on the market have a hard plastic cover that is designed to protect the coil from damage.

How do you check a lawn mower coil with an ohmmeter?

If you have a multimeter, turn its dial to the 20 K ohm scale, and insert its red lead in the common jack and its black lead in the jack marked with the ohm symbol. Test the meter before checking continuity by touching the leads together and verifying that you get a reading close to 0.

How do you fix an ignition coil?

Part 1 of 1: Replacing an ignition coil

  1. Materials Needed.
  2. Step 1: Disconnect the battery.
  3. Step 2: Locate the ignition coils.
  4. Step 3: Disconnect and remove the old ignition coil.
  5. Step 4: Install the new ignition coil.
  6. Step 5: Reconnect the battery.
  7. Step 6: Test the new coil.

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