How much resistance should a ignition coil have. 5 or 3. This is just a test. The coil for a ballast ignition system will have a primary winding resistance between 1 and 2 ohms. The secondary winding, conversely, uses extremely fine wire wrapped thousands of times around the coil’s core. 5 ohms. The external ballast resistor (or resistor wire) will provide an additional 1. I then bought another coil for a ballist visitor but they have different resistance so I gave up and bought the PCM coil that was labeled for the Pertronix ignition. 5 ohms of resistance. 030". Dec 25, 2025 · Because the wire is short and thick, the primary winding resistance is quite low, typically falling in a range between 0. How is it measured? Resistance can be measured with a Multimeter. Not intended or Q. A typical value would read 0. How does it affect performance? Aug 4, 2025 · The resistance of an ignition coil is typically measured in ohms and can vary depending on the type of coil and the vehicle manufacturer’s specifications. While I can't definitively answer what range your specific coil should read, it would typically be good to see an automotive coil read ~10,000 ohms for this check. For a FACTORY electronic ignition you should measure somewhere around (and possibly below) 1 Ohm. 6 days ago · To determine if ignition coils are faulty on motorcycles, it's essential to recognize the symptoms and perform a few basic checks. It is expressed in ohms (Ω). To test the ignition coil connect the ohmmeter's two test leads to the coils primary terminals (+ and -). the ignition switch wire. Jun 8, 2024 · This is how to test a small engine ignition coil. Connect the negative lead to the negative terminal. If the proper coil is used, remove ag st Q. Before testing, the engine must be completely shut off and cool, and the wire must be carefully disconnected from both the spark plug and the distributor or coil pack. Jun 17, 2018 · Ignition system is Ford points distributor, cap and rotor, Pertronix Ignitor and 1. I bought a new ballist resistor, no change. Set the multimeter to measure resistance (ohms). A normal ignition coil resistance reading can range from a few hundred milli-ohms to several thousand ohms. 0-ohm coil should be used on PerTronix Ignitors installed on four- and Aug 4, 2025 · By understanding the importance of resistance in ignition coils and how to measure and interpret it, vehicle owners and technicians can better maintain and troubleshoot ignition systems, ensuring optimal engine performance and longevity. 0 ohms. Jun 25, 2012 · I had resistance in my old wiring harness. 5 ohm Flamethrower coil with full time battery voltage, spiral coil resistance plug wires and brand new NGK non-resistor plugs gapped at . Should I remove the starter bypass wire? N , the starter bypass wire is ne Q. 4 - 2 ohms. 4 and 2. The 3. For a standard coil you should measure about 3 Ohms. Dec 24, 2025 · Testing Spark Plug Wire Resistance Measuring the actual resistance of a spark plug wire requires a digital multimeter set to the Ohms ( [latex]Omega [/latex]) scale. It includes 2 testing methods and an ignition coil resistance chart for easy diagnosis. . What type of coil do I Jan 25, 2017 · Choosing the correct ignition coil. 7 ohms. How can I fix a high resistance problem? resisted ignition switch. The Flame Thrower 40,000V coils have internal resistance rated at 1. Apr 13, 2017 · It typically depends on the model but 50 ohms across the positive wire post and the spark plug wire post would indicate a problem. Connect jumper wire from the negative (-) side of battery to the Ignitor black wire. For a ballast coil you should measure between 1-2 Ohms. Explore the complete ignition coil resistance chart with primary and secondary resistance values for all major brands, from Briggs & Stratton and Honda to Toyota. Zero resistance would indicate a shorted coil while a high resistance reading would indicate an open coil. If the engine starts and runs well, you may have high resistance thru your Ignition s itch. However, the coil that came on my car is an MSD Blaster 2 (pn 8203) and it has a primary resistance of 0. 5K ohms and 10. That would be the positive wire We would like to show you a description here but the site won’t allow us. 0 Ohms for most modern vehicles. 5K ohms. It needed 7 volts. Where you would see a low resistance is across the primary winding. Connect the positive lead to the positive terminal of the coil. Ignition coils play a crucial role in the engine's performance, converting the battery's low voltage to the high voltage needed to spark the fuel-air mixture in the engine's cylinders. Feb 2, 2022 · I believe, for a stock 289 motor, that we want the primary resistance in our ignition coil to be 1. Using my superior skills of deductive reasoning (ha ha) I figured the resistance wire should give a hotter spark. Most coils should read between 0. 4 and 2 ohms ; however, refer to your manufacturer’s specifications for the correct reading. That and the ballist resister was to much for the ignition. The secondary coil should generally read between 7. How can I fix a low voltage problem? ignitor wire to the ignition wire prior to the ballast resistor or resistance wire. Second, if you do not have a an external resistor you must connec t e ignitor red wire to a 12-volt source t at Q. Jan 24, 2024 · What is the resistance of an ignition coil? Most ignition coils should have a primary resistance falling somewhere between 0. 4 and 2 ohms. ibhx ufjxbcxm xkbv fmwqffv ucqg kglzt wwkf vyeree jjsysuo ppf