You should have a resistance reading of at least 3-4.5 ohms. A bad coil will show a higher reading then 3-4.5. Next, place the red or black lead from the meter to the centre of the coil , and to either one of the terminals positive or negative. You want 9500-10000 Ohms, a little less is ok but no more.
How do you test an ignition coil with a multimeter?
Insert one of the multimeter's probes into the center opening of the coil, contacting the metal terminal inside the coil. Touch the second probe of the meter to the ignition coil's grounding terminal. The meter should read 6,000 to 15,000 ohms. If it does not, the coil's secondary winding is faulty.
How do you check if a coil is bad?
- Plug the tester into the coil.
- Attach the ground wire.
- Plug in the coil connector.
- Adjust the spark gap to the correct measurement.
- Start the engine.
- If there's spark, great, it works! If there's no spark, it's a bad coil.
Should coil have 12 volts?
It should have approx 12 V with the key on. Either there is a bad connection upstream, or the wire is shorted (it is not fused).Jun 16, 2008
How do you test a 12 volt coil with a multimeter?
https://www.youtube.com/watch?v=FIx4dxew_UU
How do you test a coil with a multimeter?
https://www.youtube.com/watch?v=LbL_P_2LvmU
How do you check if a coil is good?
https://www.youtube.com/watch?v=BU2ySxRUoWo
How do you test a coil if it's bad?
- A rough idle.
- An unexplainably louder-than-usual engine.
- A noticeable lack of power.
- A significant drop in RPMs while accelerating for no apparent reason.
- A blinking or intermittently activating check engine light.
How many volts should a coil read?
To check that voltage is reaching the coil, connect the voltmeter between the + or SW terminal of the coil and earth, and switch on the ignition. The meter should read nearly 12 volts, or about 7 volts if the coil has a ballast resistor.