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the purpose of a ballast resistor

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  • use or not use ballast resistor

    Nov 14, 2011Ballast resistors are intended for the coil, not the distributor. The distributor, if rated for 12v, can ( should be able to) handle the full 12v w/out resistor. A 3 ohm coil does not need a ballast resistor. Terry is right, number of cylinders is totally irrelevant. Sean.

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  • Ballast resister

    Aug 21, 2021Tony, The resistor reduces the voltage to the coil down to about 10 volts with the ignition switch on. In the start position, the resistor is bypassed and the coil gets the full 12 volts to help with starting. Running 12 volts constantly will burn up the points.

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  • Points ignition to electronic. Removal of ballast resistor

    Jul 12, 2020The resistance wire/ballast resistor, is often 1.6 - 1.8 ohms. The coil positive terminal, may have two wires running to it, through one connector - one supplies straight battery voltage ONLY when cranking, the other supplies 9v through the resistance wire (or ballast resistor

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  • Australian RR Forums: Ballast Resistors Through the Years

    Feb 09, 2015Registered: 6-2005. Posted on Wednesday, 22 February, 2017 - 03:21 pm: The early Shadows did not use a ballast resistor. The starter motor was a Lucas M45G with an initial lock torque of 18.8 foot pound with 430 amps, and at 1000 rpm cranking speed a torque of 6.7 foot pound with 220 amps at a battery voltage of 9.75.

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  • Why a Ballast resisitor with electronic ignition ?

    Feb 15, 2006Originally the ballast resistor was used to lower the voltage so that the 6V coils could be used when they went to the 12V system. If you use a 12V coil, you don't need the ballast resistor (points or electronic ignition) Not so. The balast resistor is a current limiting device.

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  • Fluorescent Lamps, Ballasts, and Fixtures

    The only change is to add a resistor in series with the ballast. This resistor should be maybe 100 ohms for 20 and 22 watt lamps, slightly higher for lower wattage ones. It should be able to safely dissipate a wattage comparable to that of the lamp.

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  • How does a fluorescent starter work?

    Apr 01, 2000The fluorescent starter is a time-delay switch that opens after a second or two. When it opens, the voltage across the tube allows a stream of electrons to flow across the tube and ionize the mercury vapor. Without the starter, a steady stream of electrons is never created between the two filaments, and the lamp flickers.

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  • Ballast Resistor

    Jul 15, 2006Jul 14, 2006. #5. On the later Midgets, the ballast resistor is built into the harness. If you have a connector with two white and green wires connected to the (+) post of your coil, you should be good to go. One of the white and green wires goes to the ingnition switch and the other goes to the ballast resistor.

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  • Ignition ballast or not?

    11 V would indicate that you don't have a ballast, though its a bit low. I would expect around 12.5V, assuming the battery is fully charged and OK. To check which coil you have, measure the primary resistance, around 3 ohms non ballasted, around 1.5 ohms ballasted coil. A ballasted coil, with a ballast resistor would give about 6V at the terminal.

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  • Ballast Resistor Bypass

    Mar 08, 2021The purpose of this cross connection is the bypass where the starter solenoid provides +12 directly to the ignition coil when the starter is engaged from the battery directly without going through the ignition switch or resistance wire. without any ballast resistor in the line, it may run fine, but maybe too much current which is not good

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  • Ballast Resistor Lifespan? [Archive]

    Dec 04, 2008The ballast resistor on the fenderwell was added to the fuel pump circuit ca. 1988, and was offered as a voluntary recall for 1987 models. It is not necesary to emissions or driveability - my 1987 did not have it, my early 1988 had one (with the Recall Performed tag - when the resistor failed, I simply installed a bit of wire between the

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  • Resistor Basics: Types of Resistors

    Apr 18, 2020Carbon resistors are a cheap general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite (similar to pencil lead) and a non-conducting ceramic (clay) powder to bind it all together.

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  • The importance of wattage in resistors

    Dec 12, 2012100Ω resistor needs to pass 35mA. This puts us around the 1/8W line. Choose a 1/4W resistor. The 100Ω resistor needs to pass 40 to 50mA. Choose a 1/2W resistor. Example 2: 1kΩ 1/4W resistor is ok if the voltage across the resistor is less than 12V. If your power dissipation falls under the 1/8W curve, then 1/4W resistors would be fine.

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  • See Automotive Resistors and Electrical Circuits

    A ballast resistor is used in ignition circuits and hi current starting circuits. But a computers coolant temperature sensor is a great example of a thermistor type resistor. As the temperature rises and fall's the resistance also changes along with the voltage in the circuit.

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  • The great ignition debate: Points vs. Pertronix

    Jan 21, 2019The resistor's purpose is to be bypassed during starting to provide a stronger spark. Sometimes a prior owner removed the resistor in an attempt to always provide a stronger spark. The Pertronix documentation explicitly states that the total resistance of the coil plus the ballast resistor must be at least 3 ohms.

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  • Simple Neon Lamp Circuits and Working Explained

    Jul 22, 2021How to Calculate Neon Resistor. A proper value for the neon ballast resistor could be determined by taking this benchmark into account, which is relevant to the precise supply voltage utilized across it, and presuming a safe current of, approximately 0.2 milliamps, as an example. For 220 volt supply, resistor may have to lose 250 - 80 = 170

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  • Yesterday's Tractors

    For the ballast resistor (required to reduce 12 volts to 6 volts for the ignition coil), use a generic Chrysler style (NAPA #ICR13 ) or equivalent. The alternator warning light consists of small 12 volt lamp rated at about 0.2 amps. A #1815 bulb in a suitable lampholder (purchased at Radio Shack) works fine.

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  • How to Replace the Ballast in a Fluorescent Lighting Fixture

    Aug 10, 2021This article has been viewed 1,032,730 times. To safely replace the ballast in your fluorescent light, turn off the lamp, remove it, and check the voltage of the feed wires with a voltmeter. Then, use a nut driver to unscrew the nut holding the ballast in place and install the replacement ballast.

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  • E

    NOTE: The purpose of an ignition ballast resistor between the ignition switch (12V) and the ignition coil positive terminal is to restrict current flow through the ignition coil. Failure to use an ignition ballast resistor will eventually destroy the Ignition Module. EXCEPTION: If your vehicle is equipped with a HYFIRE Electronic Ignition Control

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  • Ballast Resistor?

    Jun 30, 2014The Pink/White wire is the ballast resistor. So..if you fit the Accuspark coil and ignition module, you must disconnect the Pink/White wire from the starter and connect the Yellow/white wire. This bypasses the ballast resistor and will give a constant 12v

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  • How Illuminated Switches Work

    •The resultant ballast resistor = 155Ω The power rating of this ballast resistor must also be considered: •With a forward current of 20mA and the voltage across the ballast resistor (5.0V –1.9V) = 3.1V •Power across is then calculated: 3.1V x 20mA = 0.062W •For safety purposes, a typical power rating of 2x the

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  • How do I bypass the ballast resistor?

    Sep 03, 2010Member. Sep 2, 2010. #5. Sep 2, 2010. #5. Hi Tom, My understanding is that, the Ballast Resistor isn't an actual resister in the sense that there is an item you simple bypass. Its actually a length of resisitve wire thats run (if I remember rightly) from the back of your Rev counter to the coil. Best place to start is probably the wiring

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  • 240Z, 260Z and 280Z Ignition Upgrade Guide

    This is where the ballast resistor comes in. It's purpose is to limit voltage so that at idle the coil is not damage due to longer the optimum dwell times. So a points system really provides the inverse of what an engine needs. too much dwell time at idle, tending to shorter dwell times as the RPM climbs limiting the effectiveness of the coil

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  • Ballast resistor/resistor wire?

    Oct 14, 2009Ive got a mallory unilite on my 505 and the directions say to use a ballast resistor IF you are not using the harness resistor wire. What color would the harness resistor wire be and what is the purpose of the ballast resistor. This is on a 1978 bronco.

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  • All About Ballast and Resistor Tubes

    The purpose and function of the line ballast are similar to the action of the current regulator described previously. The ballast tube automatically varies its resistance so that the filament voltage and current are maintained at proper values in spite of variation in line voltage. The ballast and resistor-"tube" symbols shown are

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  • HeNe ballast resistor question.

    Sep 05, 2008So what is the purpose of the big ballast resistor on HeNe lasers? Is it just to limit the current going to the tube or is there some other purpose I'm missing here?? Aug 26, 2008 #2 FrothyChimp New member. Joined Sep 22, 2007 Messages 977 Points 0.

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  • Ignition Coil Ballast Resistor Wiring Diagram

    Sep 02, 2021The purpose of an ignition ballast resistor between the ignition switch 12v and the ignition coil positive terminal is to restrict current flow. The typical automotive ignition system prior to 1974 consisted of a coil and ballast resistor with breaker points

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  • What is a Lighting Ballast? (with picture)

    The term lighting ballast can refer to any component of the circuit intended to limit the flow of current through the light, from a single resistor to more complex devices. A lighting ballast is necessary to operate discharge lights because they have negative resistance, meaning they are unable to regulate the amount of current that passes

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  • Problem with ballast resistor

    Oct 31, 2005Today's Posts; Member List; Calendar; BOD Contact Info; Sponsors; Sponsor Qualifications; LSJC Bylaws; Forum; Tech Stuff; General Tech Topics; If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from

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  • mallory distributor with 6AL

    Jun 09, 2014Installing an ignition ballast resistor has no effect on the performance of the ignition system. However, installing or retaining the original ignition ballast resistor allows for easy conversion back to standard ignition. The purpose of the ballast resistor is to protect the ignition coil not the electronics inside the distributor.

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  • Ballast – Triumph Club – Vintage Triumph Register

    The ballast resistor will need to be bypassed for any coil that is designed to be used without one, whether it is a high performance coil, or just a replacement, for example, using a coil from an earlier model Triumph. In the TR6, the ballast resister was used only from '74 and later. As I understand it, the modifications made to these cars

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  • What the heck is this resistor wired on my alternator

    Aug 17, 2014I'm trying to figure out what this resistor is that the PO used to bridge the #1 and #2 terminals on my alternator. My problem is the resistor gets very hot to touch (Whether the engine's running or not). I believe the alternator is a 3 wire (internal regulator) that was converted to a 1 wire setup.

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