That will show a completely open coil, replace them. No continuity to chassis ground. Many threads point to possible ignition coils going bad. The correct amount of resistance is less than 5 ohms. Use coil with 3.0 ohms primary resistance. The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. Applies to Hot Spark 3-Series (red) ignition kits. It is the part that starts the device and may fail to run when there is a problem. It is expressed in ohms (Ω). Ignition Coil, Round, Female/Socket, 3.0 ohms, Yellow, Coil Wire, Mounting Bracket, Harley-Davidson®, Kit. Of course the vapor tends to get warmer and warmer as you go from 2.0 Ohms to 1.0 Ohms, however not as warm as with sub ohm coils. Ignition Coil Primary Resistance Definition & Description. I'm looking for an ignition miss. How to Tell if an Ignition Coil is Bad. Brought to you by Infiniti Parts USA, your OEM source for Q45 parts! After checking the readings, if a zero reading is displayed, it means your ignition coil has a problem within the primary winding. It is used to show the relative power of a coil. Also r educes burning and pitting of contact breaker points. Resistance can be measured with a Multimeter. Plugged the ignition coil back in. I have about 2 ohms on the primary I was able to find the spec for that and it is good. No spark condition. Compatible Coils for Use with Hot Spark ® Ignition. Final Thoughts. Coils can be tested with an ohmmeter (most coils will give a reading around 8,000 ohms) or with the small scope on a Sun machine. Coil Ohms are describing inductance. When testing your Harley Davidson ignition coil you will be testing ohms resistance. I later discovered the correct Nology coil for the Thunderbird Sport is their model number PFC-06S. Since the coil is the center of the system, it has to be working right or the car will not run right. However, for experts, identifying the problem is quite easy; but, it can be brain-racking for newbies or who isn’t familiar with motorbike mechanical issues. Step 2. Touch your positive lead to each of the terminals on the ignition coil a good coil should read close to 9k Ohms, If your coil has more then 12-14K Ohms resistance then this is likely it needs replacing. Using a standard coil on a ballasted ignition system will result in low spark voltages potentially leading to running problems. Damage to the coil and ignition will result and will NOT be warranted. I have an MTD with a Kohler engine SV530-0029 The engine runs for like 5-10 min and suddenly stops. The plug caps, plug wires or the spark plugs themselves must have about 5K Ohms or you will be generating RF energy. Inductance is about electromagnetic force. Cylinder ignition coil (electronic ignition system with map-controlled ignition) Primary: 0.5 Ω–2.0 Ω/Secondary: 8.0 kΩ–19.0 kΩ Single-spark or dual-spark ignition coil (fully electronic ignition system) Primary: 0.3 Ω–1.0 Ω/Secondary: 8.0 kΩ–15.0 kΩ The secondary resistance will be in the thousands of ohms. Ignition coils take energy from the battery (usually 12 volts) and convert it to a high enough voltage (50,000 volts or more) to create a spark. Print view; 3 posts • Page 1 of 1. willko1 Posts: 123 Joined: Mon Aug 13, 2012 9:22 pm But that's a whole nother set of stuff to work through. If resistance is not .6-.8 ohm, replace ignition coil. Set the meter to 20K Ohm setting, and attach the leads to the ignition coil's center terminal. Ignition coil secondary resistance = 5K to 10K Ohms" Today, I measured the secondary of one of my coils (did not remove the coil from the engine) and I measured 6.24K Ohms from tower to tower. Spin the engine over (at least 250 RPM) and watch for spark in the tester window. Set the positive lead of the multi-meter in position where the spark plug would usually insert – ensure it has made good contact. However, it is more common for coil problems to show up as hard starting, a repeated high-speed miss or a gradual decline in ignition system performance. Ignition Type: Coil Type : Ballast Resistor Requirements : OEM Breaker points: OEM coils (2.0 ohm primary resistance) Retain stock 3.0 ohm ballast. Setting multimeter on 200 ohms: the primary is bouncing between 0.8 and 0.9. Product Overview II . Standard ignition coils will have a primary resistance close to 3 ohms while ballast ignition coils are typically between 1 ohms and 2 ohms. A working ignition coil will give a reading of between 2.5 – 5 k ohms. You will find that the primary resistance will be a low number; 0.5 to 5 ohms, for example. See if the reading is within this range. NOTE: DO NOT use the DC6-5 coil with the DS6-2. book says 130-190 "ohms" Battery: Still 12.17 ohms. If you are reading 0.0 between the tower terminal and either of the 2 other terminals, the coil is bad I think (correct me if I'm wrong) the stock coils are 5.8 Ohms. The FCC will come after you. ? Decided to leave the group of brown wires on that post instead of letting them hang loose in the engine compartment like I found them. Measure resistance between coil tower and each terminal of distributor 2-pin connector. The coil is probably the easiest thing to check and therefore the first thing to check when embarking upon ignition system troubleshooting. the incorrect type of HT coil, IE one that does not have the metal frame around the coil body this maybe the cause of poor starting. The ignition coil also called ignition armature, is a crucial functional tool in the power system of a leaf blower, especially the one powered by gas. Testing the Coil or Armature Clip one end of the spark tester (service part number 19368) to the ignition cable and the other grounded to the cylinder head Canister Coils are designed for those stock or street/strip applications while E-Coils are engineered to suit high-vibration, high-performance applications and Direct OEM replacement FORD COP and GM LS Coils round out the line. Step 2. Step 1. If the coil fires when you cause a momentary ground, then the ignition would be suspect. Primary resistance is the measure of how hard it is for current to flow through the primary windings. How is it measured? Rather than get into the specifics of every application we make the general recommendation - 5 ohm for street, 3 ohm for race. Recommended - DC1-1. Consider 1.83 ohm auto-replacement ballast per above discussion for improved performance at the expense of accelerated points wear and slight increased potential for premature early coil failure Post Reply . 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