The resistor wire between the ignition circuit and the coil fried so I am replacin it with a ballast resitor to drop the voltage fro 12V to 9V so I don't burn up the coil. Part # : BK S43243. Total about 3 ohm total If I keep the ballast resistor then I think I buy a 1.5 ohm. But for a Pertronix I using a 1.5 Ohm coil you need a ballast resistor or a supply of new coils for regular replacement. Skip to main content. External Resisted Ignition Coils have an internal resistance of 1.5 Ohms and when combined with the Ballast Resistor you get a total resistance of 3.0 Ohms which is necessary for 12 Volt ignitions systems. The ballast resistor, supplies the needed voltage during the start up, and then immediately after the arc is established, it reduces the voltage in addition to regulating the current flow. For what it's worth, I have been using a ballast resistor on my CD175 for a few years now with no problems at all. As Rob says, surprising an unballasted 1.5ohm coil hasn't cooked but maybe you haven't been on any long journeys. Tech Question Erik Bakko, Brooklyn, NY, 72 Dodge Swinger 318ciDear Mr. Mopar Guru,My ballast resistors have an expected life span of 3 months in my Dart. These Summit® ballast resistors are perfect for protecting your points-style ignition system. If the original coil was simply given 12V through the ignition system then have no fear. Description #B4008-006, Ballast Resistor for Ignition Coils . I have a 1986 Glastron with a 3.0 Mercruiser. Its also surprising that the Ignitor worked satisfactorily … Pickup in Store not currently available. Interesting, a 71 car should have no ballast resistor and use a 3 ohm coil. The solution to this problem was the ballast which reduces the voltage down to the 6-9 volts the 1.5 ohm coil prefers. Our Ballast Resistor is designed to be used in conjunction with our available External Resisted Ignitions Coils. You can detect the presence of the resistor by measuring the ohms of primary side of the coil (terminal 15 vs. terminal 1). The external resistor coil most likely has 1.5 ohms resistance, so you need a 1.5 ohm external resistor to have 3.0 ohms. A Pertronix II or III is a different story. Check the multi-meter ohm setting. Another approach is to eliminate the ballast resistor altogether by using a replacement coil with 3.0 ohms of resistance. Order Ballast Resistor for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 2.9 total. 4. They allow you to install aftermarket coils without worrying about frying your ignition. That is what I bought but it only drops the voltage maybe half a volt. Requires 9 V supply, with ballast resistor of 1.8 ohms. I've blown up two of these, one from not having a matched coil and ballast resistor (the total series resistance from the input of the ballast resistor to coil terminal 1 MUST NOT BE LESS THAN 3 OHMS OR IT IS LIKELY TO COOK THE PERTRONIX), and second one from just being a dope. The external ballast resistor (or resistor wire) will provide an additional 1.5 ohms of resistance. EUR 9.98 + EUR 4.74 postage; 9 Watching. Thing is someone says I need a ballast resistor or I may blow up my tacho?? Output 29.1 kV @ 100Hz. The Flame Thrower 40,000V coils have internal resistance rated at 1.5 or 3.0 ohms. IF you are using points ignition and the standard Mopar coil (or the equlivant coil) the ballast resistor is 0.5 ohms. Can I remove the ballast resistor and run a 3 ohm coil? Part Number: RRA-18-5450 Not Yet Reviewed I am in the process of installing a points distributor system in my model T (SBC). Check here for special coupons and promotions. Ballast Resistor. I have a factory tach that I still wanted to work so I kept the 1.5 ohm pink wire in place. Without a ballast, ... 3. Our Ballast Resistor is designed to be used in conjunction with our available External Resisted Ignitions Coils.External Resisted Ignition Coils have an internal resistance of 1.5 Ohms and when combined with the Ballast Resistor you get a total resistance of 3.0 Ohms which is necessary for 12 Volt ignitions systems. The 5.0 ohm section provided a low voltage source to the ECU module internal circuitry thru the 5th pin connection, while the 0.5 ohm section of the ballast resistor provided CURRENT limiting function for the ECU's switching transistor AND the coil's primary winding. Find Summit Racing SUM-G5218 Summit Racing® Ballast Resistors and get Free Shipping on Orders Over $99 at Summit Racing! A ballast resistor is a resistor inserted into a circuit to compensate for different changes. That's my $.02 That's with a 1.5 ohm ballast resistor and a 1.5 ohm coil. When I changed to 12v I kept the old coil and fitted a 2 ohm resistor in series. If your multi-meter has different ohm settings, then put it on the “X1k” position. This Video explains how the Ballast Resistor Works.For additional How-to Tutorials Visit our Website: http://www.howstuffinmycarworks.com Ballast Resistor in Fluorescent Lamp I believe single should read 1.8 ohms and dual should read 1.8 and 5 ohms. Secondary resistance - 8 - 10,000 ohms. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Shop with confidence. Ballast Resistors, Marine Coil Resistors, 1.50 ohms Resistance, Each. In my research I have read on here some of Bubba's threads and posts recommending 3 ohms resistance in the 12 volt+ feed to the coil. You should be getting 9 … Find great deals on eBay for ballast resistor and lucas ballast resistor. The ballast resistor has a resistance of 1.6 ohm. The coil for a ballast ignition system will have a primary winding resistance between 1 and 2 ohms. --Rob What I am wondering is if the 1.6 ohm coil will have sufficient output for normal running with reduced voltage supplied to the primary due to the 3 ohm resistor? The 1.5 ohm would require a resistor (or be a direct replacement for the stock coil), the 3 ohm would not. From United Kingdom; About the Product. Multi-meter Ohm Setting. My ballast resistor is 2.0 ohms and I have a .9 ohm coil. When voltage is tested, coil negative connected to gound and key turned to on, there is … First, the ballast resistor is the long, white ceramic thing attached to the left side of the coil assembly. If the voltage measures more than +14.2 volts, you'll need to replace the voltage regulator, install a coil with 3 Ohms or more internal primary resistance or install a 1.4 Ohm external ballast resistor between the ignition switch and the coil's + terminal. If the tractor is equipped with a magneto, the basic ignition system itself will be unaffected by the change from 6 to 12 volts. It isn't, however, just that simple. It say's OEM replaceent, it also shows a 1.76 ohm resistance built in primarily. So you should go with OEM voltage delivery. If you use the coil with the external resistor just make sure you have an external resistor. Two commonly available 3 ohm coils are the Napa IC14 and the Pertronix High Voltage 40511. And as mentioned, a 1.5 Ohm coil without a ballast resistor will be pulling 14.5/1.5 = 9.7 Amps. This is a resistor inside the coil on the primary side that reduces the current flow partly so the points don't burn up. Coil for a Pertronix II or III is a different story eligible for to! The 6v coil is 2 ohms Ignitor worked satisfactorily … ballast resistor and a starting switch is! I kept the old coil and fitted a 2 ohm resistor in series to. 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