You can test the resistance of the coil using a voltmeter and measure the Ohms (resistance) across the +’ve and –’ve 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. Also, mount the coil so the coil wire is as short as possible to keep resistance low. It's impractical to uncover the coil and examine the wire; fortunately, there's an easier way to find a break -- a continuity test. These are gener - ally found on late model DIS or coil-per-cylinder ignitions. One winding is the primary winding, the other is the secondary. The winding ratio of primary to secondary winding is 1:100. In this test, you pass a small electric current through the wire and measure resistance with an ohmmeter. 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. at 3,000rpm °BTDC 37 at 8,000rpm °BTDC 37 . The low resistance helps to produce up to 45,000 V. Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016) Ignition timing at 1,000rpm °BTDC 34 . If the coil is intact, the resistance is a measurable number in the order of 2,500 to 5,000 ohms. This way you don't risk damaging the COP ignition coils connector terminals. What will make this possible is if you use a wire-piercing probe to attach to your multimeter leads. To find out for sure, use a multimeter to check the voltage on the positive wire of the coil with the ignition on. Typically, the ignition coil can go bad over time due to either long-term wear and tear or due to bad spark plug ignition cables. Caution: Coils that have an internal power transistor are NOT compatible with MSD Ignition Controls. In the case of a conventional cylinder ignition coil, … Carburetor The technical structure can vary, depending on the ignition coil‘s area of application. Use of any coil that is not compatible may damage the MSD and void the warranty. Moss Motors Tech department shows you how to test your coils Ohm rating. Secondary coil resistance kΩ 1.2 - 1.8 . These coils are called windings. The Ohmic resistance of the coil is about 0.2-3.0 Ohm primary and 5-20 kOhm secon-dary. PET-9000 Parameter #1 357 #2 07 . All of the circuits can be tested without having to unplug the Coil-On-Plug ignition coil. 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. Primary coil resistance Ω 160 - 200 . The Makeup of the Coil . 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