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Testing hei coil

Jan 12, 2010 · To test the COP ignition coils you do not need an automotive diagnostic scan tool (commonly known as a scanner or scan tool). You do need a few basic tools and these tools won't break the bank. An HEI spark tester Mar 21, 2016 · Ford part number for the low-impedance DS-1 ignition coil is D7AZ-12029-A. However, due to the special dwell circuit, many other high-energy coils may be used, such as the GM HEI external coil, the Ford TFI coil, and many aftermarket equivalents. Ford models using the DuraSpark-I (California-only) include: 1977 Custom 1978-'79 Fairmont 2. Connect the ground side of your test lamp to the battery POSITIVE cable. Probe the TACH terminal on the dist. cap while a helper attempts to start the engine. The test lamp should blink repeatedly as the engine cranks. No blink= bad module or pickup coil. Further testing is required to pinpoint the problem. Blink but no spark = bad ignition ...NEW REPLACEMENT MODULE FOR GM STYLE HEI DISTRIBUTORS. New OE style replacement 4 Pin module for use with the GM (Chevy, Oldsmobile, Pontiac & Buick) Large Cap distributors. Will also work on aftermarket FORD & Mopar HEI distributors that have the large GM style cap (coil-in-cap). These are for carbureted vehicles. As a kid, my cousin recieved a good beating after he cranked over my Road Runner while I was laying on the wet fender,in the pouring rain, reseating the coil wire in the 50KV Accel Racing coil. Seems he could not defend himself because he was laughing so hard. The 4 pin HEI's don't supply advance, though they do have a unique, efficient method of controlling current and dwell to the coil that's a big improvement over points. I believe the 5 pin ones have some limited form of advance (or retard actually) specific to a 'limp home mode', not applicable here. OK, lesson number 1: It's the coil. Does not matter if it's a Ford Dura-Spark or a GM HEI, the coil is the common failure point. These are all epoxy potted E Coils. They have poor thermal conductivity. Ford's at least are out in the open. GM's are in in the back of the engine with poor air circulation and under a "Coil Cover" that helps trap ... How can you tell if it’s good? If you have an ohmmeter, connect the test leads together and zero the meter. If the meter won’t zero replace the battery. Select the highest R times range you have, R times 10,000 works good. Connect the test leads to the capacitor while watching the meter. The movement on scale means it’s taking the charge. [DIY coil tester in use] Connect the coil to the tester & see if it can fire a 3/4-7/8" spark gap. Works on 2-wire COP units like Fords or Chryslers, or most any "hei" type coil. The basic idea is that a square wave signal generator drives an ignition module- that fires the coil. Here's the functional block diagram. Remove the ignition coil mounting screws and detach the coil, with the wires, from the cap. Remove the arc seal (rubber pad under the coil). Clean the coil housing and the rest of the cap with a soft cloth and check the cap for defects. Replace if necessary. Install the new coil and tighten the mounting screws securely. Jul 17, 2005 · Too much resistance in the spark plug wires or a bad HEI bushing can cause the coil to fail. As far as testing the module, there really is no way for you to do that. Normally, if something is wrong with it, the engine will not run at all. If it is one of our modules, you can send it into our repair department and we can take a look at it. nal on the coil. There may be an additional capacitor on the coil - terminal. This is to eliminate radio interference. Notes on wiring for an "HEI" distributor with the coil in the cap; If you are converting from a points type distributor, you have to make sure that the "resistance" power wire is bypassed! It's best to just run a new 12- With certain coils, the secondary windings will show no resistance, which will be a false indication that it's a defective coil. Therefore, the best way to test a coil to find if it's in good condition to produce a strong spark is with three jumper wires (with alligator clips), a battery-ignition condenser and a fully charged 12 volt battery ... The Stator is the plate holding all of the electrical coils of wire, which is used to power ON the ignition coil, bike’s lights, and battery charging circuits. Charging Coil The charging coil is one coil in the stator, which is used to produce 6 volts to charge the capacitor C1. TEST 3: Testing for Spark at the Ignition Coil (Part 1) OK, with this test you're going to find out if the Spark Plug Wire that feeds the Spark from the Ignition Coil to the Distributor is BAD. Remove the Spark Plug Wire that is attached to the center of the Distributor Cap and attach the HEI Spark Tester to this wire. Jul 12, 2018 · By isolating each component and testing voltage or Ohm. You will be surprised at how easy it is. There is a lot more information in the original article, and If you’re looking for a way to test your HEI distributor, this article explains how, and why Performance Distributors should be your go-to source. If there is no spark, substitute a new coil and repeat test #2. Now if you get spark, install a new coil. NO SPARK, replace ign. amp. In #2, if there is No voltage present, disconnect the white/red wire and check it again for 12 volts. If 12 volts is present, replace the ignition sensor inside the dist. cap. YEARONE Classic Car Parts for American Muscle Cars | Barracuda Cuda Challenger Charger Chevelle Road Runner Camaro Super Bee Dart Duster Valiant Firebird GTO Cutlass 442 Mustang Nova GM Truck Skylark GS Monte Carlo El Camino Mopar Chevy

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Sep 15, 2012 · The light should glow intermittently, indicating the module and pickup coil are working. Remove the distributor cap and check for spark at the center terminal of the cap using the H.E.I. Test Spark Plug and a jumper wire. If there is no spark, the rotor is not working and should be replaced. Correct, if the 9V coil is fed with 12V. In my case, the first one was plain 12V and overheated, then the other I tried is 9V with resistor, correctly hooked, still overheated. – Aram Alvarez Apr 8 '17 at 0:36 Jul 06, 2016 · On a factory HEI, the primary coil leads will either be white and red, or yellow and red. The colors of the leads determine the direction the coil is wound, which determines its polarity. Whenever you are replacing a coil or distributor, it's always a good idea to be sure to the ground clip is transferred from the old cap to the ... Dec 11, 2017 · Testing the secondary circuit of the coil. The primary resistance value should be between 0.6 – 1.5 ohms. To check the secondary resistance, remove the screws that hold the coil in the cap, remove the coil and touch the negative meter lead to the ring terminal on the black wire (between the red and yellow) and touch the positive lead to the bottom of the coil where the rotor bushing makes contact. Sep 12, 2006 · Discuss Testing Ignition Coil (1984 GMC 1500 Sierra Classic) in the alt.trucks.chevy forum at Car Dealer Forums; Hi, My father owns an '84 GMC 1500 Sierra Classic.It turns over but doesn't ... Dec 09, 2012 · I then have the wires from distributor running up to coil + and - . I am thinking I need to run a 14 gauge wire from back of starter switch to HEI coil + but the question is which lead to hook up to and am I thinking corect. please respond to [email protected] if you have an answer for me on the proper wiring of an HEI distributor on a 57 chevy. The ECU's trigger output wire (BL/O) feeds the HEI's pin 'G'. Ground the HEI's pin 'W'. Ground the HEI's base. HEI's pin 'B' taps into the +12V dizzy feed wire (BK/P). HEI's pin 'C' taps into the coil's primary wire (Y/G). Claim is that their ECM is Negative Edge triggering, so no problem.