Its function is to generate the electrical spark needed to ignite gasoline in the engine. Set the dial on an ohm meter or multi-meter to 20k ohms. The 12-volt pole is the spot where the power comes into your coil. Some vehicle ignition systems use coil packs to convert the power from the 12-volt battery in your car to the necessary 35,000 volts required to fire spark plugs instead of a distributor and rotor assembly. He has been writing and editing books and articles on gardening, home improvement, woodworking, and home decor for more than 30 years. Ground the spark tester with a battery jump start cable directly on the battery negative (-) terminal. Comparing the results to the manufacturer’s specifications is supposed … Start your diagnostic from TEST 1, do not skip around from test to test unless instructed to do so by the TEST you are currently on. Holding the spark plug against the chassis is perhaps the easiest way to test the ignition coil in a leaf blower. An ignition coil is a kind of high-voltage transformer. Though its precise location may vary from vehicle to vehicle, generally, it is located near the fender or bolted to a bracket fairly close to the distributor. The key here will be to install the new coil so the gap between the magnets on the coil and the flywheel follow the manufacturer's specifications. To test the resistance of the coil in your chainsaw which is called a bench test, take your multimeter and remove the coil from your chainsaw to get easy access to its electrical terminals. Also know, how do you test a Kawasaki ignition coil? What the Coil Does . There are two coils of wire, termed windings, within an ignition coil. It consists generally of two sets of wires that are wrapped around an iron core. Lay the ignition coil on a work surface. If the spark tester sparks, then you can conclude that the ignition coil is OK (not defective). Ignition coilstake energy from the battery (generally 12 volts) and convert it to a high enough voltage (50,000 volts or more) to create a spark. Place the test leads from the ohmmeter on the side terminals, one on each side. Although accessing and removing the ignition coil may vary from model to model, the process will be similar for all lawnmowers. It will be marked with a + sign, or it might only be indicated by a number. Loosen the mounting bolts that hold the ignition coil to the engine frame. Weak ignition coil. Then the engine is cranked to see if the spark tester sparks. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Turn the vehicle off and open the hood. It's impractical to uncover the coil and examine the wire; fortunately, there's an easier way to find a break -- a continuity test. This will usually mean unscrewing small bolts or screws, or sometimes a pair of set screws. But before you do any test, it is important to take certain precautions. The ignition coil is usually hidden beneath the cover your lawnmower but is clearly visible when you take the motor cover off. You can find this tutorial in Spanish here: Cómo Probar Las Bobinas De Encendido (2002-2005 4.2L Chevrolet TrailBlazer) (at: autotecnico-online.com). The engine idles fine but breaks up under load. He lives in Minneapolis, MN. Step 5: Test the secondary circuit of the ignition coil. This is a completely safe method that will work on any ignition coil. Without this spark the end result is a dead cylinder that is not producing power. As you're already aware the ignition coil's job is to supply spark to its cylinder. Old-timers and very experienced backyard mechanics may swear by this method, but it has some small inherent danger of shock and fire, so our technique involves removing the ignition module and testing it with an ohm meter, a common electrician's tool. 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