In the case of a conventional cylinder ignition coil, … If a spark plug or plug wire is open or has excessive resistance, the ignition coil's output voltage can rise to the point where it burns through the coil's internal insulation causing a short. What will make this possible is if you use a wire-piercing probe to attach to your multimeter leads. at 3,000rpm °BTDC 37 at 8,000rpm °BTDC 37 . The insulation in many coils can be damaged if output exceeds 35,000 volts. The technical structure can vary, depending on the ignition coil‘s area of application. Circuit Descriptions Of The C-O-P Ignition Coil Connector. The winding ratio of primary to secondary winding is 1:100. You can test the resistance of the coil using a voltmeter and measure the Ohms (resistance) across the +’ve and –’ve terminals. Secondary coil resistance kΩ 1.2 - 1.8 . The low resistance helps to produce up to 45,000 V. All of the circuits can be tested without having to unplug the Coil-On-Plug ignition coil. A standard coil should read around 3 Ohms or around 12 volts These coils are called windings. Note: If a high-voltage diode is built into an ignition coil to suppress sparks, it is not possible to measure the resistance of the secondary coil. Moss Motors Tech department shows you how to test your coils Ohm rating. One winding is the primary winding, the other is the secondary. Caution: Coils that have an internal power transistor are NOT compatible with MSD Ignition Controls. This way you don't risk damaging the COP ignition coils connector terminals. In this case, the following method is helpful: Connect a voltmeter in series between the secondary winding of the ignition coil and a battery. If the coil is intact, the resistance is a measurable number in the order of 2,500 to 5,000 ohms. Use of any coil that is not compatible may damage the MSD and void the warranty. To find out for sure, use a multimeter to check the voltage on the positive wire of the coil with the ignition on. It's impractical to uncover the coil and examine the wire; fortunately, there's an easier way to find a break -- a continuity test. The Makeup of the Coil . If the spark plug ignition cables are getting faulty, it will have a much higher than normal resistance which causes additional voltage to be generated by the ignition coil … In this test, you pass a small electric current through the wire and measure resistance with an ohmmeter. Flame Thrower II coils have lower resistance, 0.6 ohms for use with Ignitor II ignition systems as well as many other high-energy ignitions. The primary winding gets the juice together to make a spark and the secondary sends it out the door to the distributor. Carburetor Also, mount the coil so the coil wire is as short as possible to keep resistance low. PET-9000 Parameter #1 357 #2 07 . These are gener - ally found on late model DIS or coil-per-cylinder ignitions. 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