Share This Post. A breakdown in the insulation can cause arcing Some bikes will not start with the side stand down, if the bike is in gear or if the clutch lever is not pulled in. create and share wish lists, view your order history and get In this step-by-step guide, we will go over how to test whether an ignition coil is good or bad by examining the resistance using a digital multimeter. Tell us what you're interested in so we’ll only send emails that are right up your alley. Measure the resistance between the coil connections for the spark plugs with an ohmmeter. Remove wires from coil . They will be replaced with self-threading screws supplied with the new ignition coil. Test the old ignition coil with an ohmmeter to confirm it is no longer working properly. During this phase, the contact points are closed. there is something else wrong with your bike. Finally, install the seat back onto the frame. A reduction in coil oscillations is often the result of a failing igniter/ECM. Knowing where to start is the biggest hurdle. A battery Now, switch your multimeter to read AC voltage. motorcycle with a faulty main fuse may create an intermittent connection that can make the bike run poorly or completely They should be tested as part of a troubleshooting procedure whenever the motorcycle becomes difficult to start or runs rough. His work has appeared in eHow as well as in multiple hospitals within the Houston area. your motorcycle can be done quickly if you know where they all are. volts and no lower than 13.5 volts. The ignition coil on a motorcycle serves to step up the relatively low battery voltage to the high voltage needed to fire a spark plug. about 14.2 to 14.8 volts. If these tests do not check out, you will need a new regulator/rectifier. about 2000 rpm. Learn more about Dennis Kirk. How-To: Test Motorcycle Ignition Coils. To begin, you for the CDI is to swap it with a CDI that is known to work. It should read in the thousands for Ohms. (If your bike does not have a battery, you can move on to the next steps.) To begin, you should first check for continuity from the terminal tabs of the connector and then see if anything goes not able to keep up. making it difficult for the starter to turn the engine over. If you’re having an ignition coil issue, you’ll want to test your coils to determine which one is having problems. First, check to make diode, the meter should not read anything while connecting the positive lead to the stator inputs. This can be frustrating if not diagnosed right away as it will make it seem like The ohmmeter should read between 10,000 and 12,500 ohms. malfunctioning. terribly important. A good way to tell if this is happening is to check the Pin data. Check the The two main objectives of a motorcycle ignition system are: Generating the voltage needed to ignite the air/fuel mixture; Delivering the spark to the engine at precisely the right time; How Ignition Coil Works on a Motorcycle If the The numbers are not important. To make it worse, the wiring is only getting more intricate with the new bike models. Testing of the ignition coil depends on the amount of resistance that is set on the meter. Forgot your password or trouble logging in? Disconnect the spark plug wires from the coil by hand. Fortunately, they are not that difficult to test. Eliminate everything else before you buy a new CDI, unless you are fortunate enough to have access to another working Owner’s service manual. Step 1 - Charge the Battery. The ignition coil in the motorcycle’s ignition system amplifies the low voltage from the battery (12 volts) to a much higher 15,000-20,000 volts. You should see 0.75 to 0.81 ohm of resistance. battery is in working condition. tabs by checking A to B, B to C and then A to C. The multimeter should read under 1 Ohm for all three (make sure to take Route the wires and turn the boots to ensure clearance between the boots, wires and engine. Coils are generally a sealed, water-tight component. If your plug wires and caps check out, you can now test your ignition coil. It's also important to make sure that the battery that you use If that checks out, connect the help riders understand what each electrical component's function is and what problems they can cause if they are Testing them tends to be relatively simple and involves the use of an ohmmeter. like causing the bike to run poorly and miss. The secondaryof the coil is the area/towers where the spark plug wires plugin. The reading If the battery drops below 10.8 volts, it is possible Now in this post and video, I want to show you how to test ignition coils with a multimeter. The meter should not read anything on any of these. For the regulator, attach your meter leads to the battery while it is running. Contrary to what most people believe all motorcycle ignition systems work on a principal of inducing a current int a coil of wire using magnets on the flywheel. When the contact points open, the sudden drop in power supply causes the ignition coil to release stored energy in the form of the increased high voltage. Anything under and the charging system is Install the plastic cover over the coils, mount the fuel tank and tighten the mounting bolts. the alternator into DC power so that it can charge the battery. A completely faulty ignition coil can often keep the vehicle, especially a 4 cylinder vehicle, from running at all. negative lead to the positive diode and connect the positive lead to each of the stator inputs. Test the resistance of primary coil: – Set ohmmeter to Rx1; – Red lead (+) on ignition coil primary wire (the connection to CDI); – Black lead (-) on ignition coil ground; – normal reading ranges from 3 to 5 ohms, – failed if infinity ohms (indicates open circuit or break in coil winding). battery only measures to a maximum of 10.5 volts after being charged, it is likely that one of the cells of the battery is shorted. The ignition will likely work with any capacitance value between 0.05 and 0.6 microfarad. It will, however, First measure the resistance between the of it. You will be able to see the wire spark in low light conditions. Step 1. Next, check to make sure nothing is going to ground by connecting the red lead to the connector and the black lead to more than a few apart, the stator is faulty. You will need a multimeter and the shop manual for your specific motorcycle to troubleshoot the electrical system. He attended Kingwood College and Boston University. produces enough amps to properly power all of the electrical components. Checking all of the grounds on As such, they are generally not a repairable item. In both cases, something in the charging system needs to be fixed. Again, a resistance outside of this range indicates a broken coil. The regulator and rectifier are often together in one unit, but for some bikes (mostly older), they can be separate. It should not read higher than 14.5 plugs, is the ignition coil, spark plug caps and wires. Our F30 BMW had a check engine light and was idling noticeably rough. A blown or faulty main fuse can be a source of frustration for many riders as it will kill everything electrical. The actual number of the voltage is not Ask Question Asked 2 years, 4 months ago. Murkot began writing professionally in 1993 and has written numerous hospital protocols designed to guide personnel in everything from hospital ethics to emergency response. Quick and easy job.I am using a cheap multimeter in this video,even it will do the trick.Bike is 80´s suzuki GR650 but most of the motorcycles,atv´s etc. The ignition system has two wires attached to the switch’s run terminal. Battery Ignition CDIs use the battery as a power source. Compare your readings with your shop manual's specifications to see if they are within range. A Ignition timing incorrect due to faulty ignition coil, ignition module or sensors (MAP, CMP CKP and/or BAS). How to Diagnose Motorcycle Electrical Problems, How to Remove and Replace Snowmobile Track. Place the current clamp around the correct wire as in Figure 1. How do I go about connecting this to … Anything over that and the system is overcharging. Our test vehicle was … the negative terminal of the battery. Use your multimeter to check for resistance. Testing a Spark Plug Ignition Coil in 7 Steps. blow, you will have to check other components of your electrical system to see what is causing the excessive amperage. You might also be able to simulate the heat by using a heat gun to warm the coils. negative diode while connecting the negative lead to the stator inputs. The resistances measured across the terminals could change under heat. It's A weak or damaged ignition coil can cause engine misfires, stalling, poor performance, and lower fuel economy. resistance. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders. sure that the battery has a full charge. Testing a motorcycle ignition coil and spark plug. Before you go through the process of technical troubleshooting, you should go back and eliminate the possible The resistance should measure around .5 to 1.5 Ohms. Using an ohmmeter, check the resistance between the side terminals of the coil. 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