only 9 volts at coil

The relay in the circuit has a coil rated for 9 VDC and a switch rating of 10 A at 117 VAC. The advantage of the low voltage coils is obviously electrical safety. AKV Only coils (18W dc) made befor e June 1999 will have a resistance of approximately 1,9 K ohms. Problem: only 9 volts at + terminal at coil when cranking. The demand: 500 V DC between the wire and … The voltage at coil reads 0.8v at the + post on the coil once the key is switched on, 12.0v when key is off. Only question left is - do I go with a lower value ballast to increase voltage at the coil a little more, or is that even beneficial at this point? The starter solenoid will usually energize at as little as 9 volts. Last edited: Jun 16, 2008. slickrock. The coil in a ballast-resistor system is rated at 7-8 volts instead of 12 volts. Use the total voltage to find the voltage across each resistor. Does the starter solenoid energize? Reply. Checked voltage at battery had 12.50 volts, checked at coil with key on 12.50, cranked engine got 9.75 at coil, went to battery again and checked volts had 12.48 volts, cranked engine while checking volts at battery got 10.85 volts. In time, the coil’s output voltage can rise to damaging levels, causing short circuits when it burns through the insulation. Yes, if the points are open and/or the electronic module is NOT CLOSED then you will measure battery voltage on both the coil (+) and coil(-) terminals. It may require only 1,000 volts for it to ignite when the engine is idling and cylinder pressure is low, but then need 20,000 volts to climb a hill under full throttle. If it is an old system then it should be ~ 12 v as shown below when the car is not not running as no switching is taking place. Thanks. Let's say a circuit with two parallel resistors is powered by a 6 volt battery. The best way would be to disconnect the cable, sand its end, and reattach. The voltages is shown on the screen more than 7 volts. Disconnect your engine's main negative battery cable with a wrench. Hi TTTOE. If the person holding the switch decides to take it apart, he or she won’t be exposed to dangerous voltage. Step 2. Once the engine is running, the voltage rises up to 13 or more and to prevent overheating the coil, the ballast resister drops the volage. Fast Eddy. Only then we will be able to build and debug one successfully. Using a non-ballasted coil would mean that you are running a 12v coil on a 9v feed, resulting in a weak spark. Loosen and re-snug the nut holding the wire to the solenoid. When overdriving the coil with a voltage greater than that of the electrical system it was designed for (usually 12 volts), it is possible to damage the primary if the switch is left on too long. In wattages mode, i’m using 0.9 ohm single coil and set wattages to 45 watts. This configuration illustrates operation of the secondary as a pumped resonator. The charging coil is one coil in the stator, which is used to produce 6 volts to charge the capacitor C1. • Pick-Up Voltage (Pull-In Voltage or Must Operate Voltage) As the voltage on an unoperated relay is increased, the value at or below which all contacts must function (transfer). At the same time the PCM activates the ASD relay, it starts to switch the ignition coil ON and OFF by interrupting the ignition coil's primary voltage. What should voltage at coil (+) be when cranking engine? What's puzzling me is that the engine DOES start. A ballast coil should read around 1.5 Ohms or around 6 volts (maximum 3.4 Ohms is ideal for our systems) Which coil should I use if my car has a ballast resistor? Each parallel wire has the same voltage as the entire circuit. The resistance for Z -and F - coils is the same. The reason I asked the voltage is if you dont have enough voltage coming in the voltage out wont be there . The primary winding of a traditional transistor Tesla coil is wound around only the bottom portion of the secondary coil. The actual output should less than 45 watt right? This posed a dilemma for the ignition designer. Joined Apr 5, 2006 Messages 13,867 Location NorCal Jun 16, 2008 #2 Edit: no fuse, doh . 1978 Inline 6 Mercruiser. Joined: Jul 19, 2008 Location: Md Local Time: 2:36 PM. Then the electricity travels to the distributor, which distributes the current to the cylinders. Turn the ignition key to START. Thus, only 9 VDC passes through the handheld pushbutton. However, always make sure your power supply does meet or exceed the power requirement of the solenoid. The secondary coil, having 100 times more turns than the primary coil, amplifies this voltage to approximately 20,000 volts, and this voltage feeds to the spark plug. The high voltage on the secondary coil can be up to 40 kV, depending on the ignition coil. Since there is no current flowing through the coil (no path to earth) then both sides of the coil will be at the same potential. THANKS EVERYONE for helping! Many riding lawn mowers do have a battery if they have accessories like headlights and electric start. If it's working, the voltage won't go above 13.5 or 14 v. Keeping the voltage down when the engine revs is the regulator's job. The extremely low resistance of 0.32 ohms results in 45,000 V and a coil that charges to peak, current typically 30-70 percent faster the other coils. Disconnect the small grounding wire, attached to the side of the coil, with a wrench. While cranking I only get 5.7 volts. Measuring the primary and secondary resistance requires an ohmmeter, and a digital readout is best if you have access to one. Do the same to the battery cables. Shouldn't I be getting battery voltage (at least 12 volts)? I ran across this low voltage while trying to troubleshoot my warm start problems. 383man Well-Known Member. • Nominal Coil Voltage (Rated Coil Voltage) A single value (or narrow range) of source voltage intended by design to be applied to the coil or input. If the coil (remember it's a bank account) has only enough energy in it to support the ignition load at idle and the engine is only being asked to idle, the engine runs fine. ? Now I have the cable from the battery to the reduction gear starter loose and the wire to the starter solenoid loose. Should I change the coil to lower ohm? Should a full 12 volts be running to the + on the coil when the ignition is on (without engine running)? Z coils are now discontinued! This effect is called mutual inductance: the induction of a voltage in one coil in response to a change in current in the other coil. A standard coil should read around 3 Ohms or around 12 volts. Coils made hereafter will have a resistance of approximately 2,5 K ohms. The isolation resistance between one of the coil connectors and ground should exceed 20G ohms. Like normal (self-) inductance, it is measured in the unit of Henrys, but unlike normal inductance it is symbolized by the capital letter “M” rather than the letter “L”: No current will exist in the secondary coil, since it is open-circuited. 1 Iron core, 2 Insulating compound, 3 Sealant, 4 Secondary winding, 5 Primary winding, 6 Cladding sheet, 7 Fastening clip, 8 Housing, 9 High-voltage spring contact, 10 Insulating cover, 11 Insulating material, 12 High-voltage output, A Terminal 15, B Terminal 4, C Terminal 1 . Vacuum tube coils typically operate with plate voltages between 1500 and 6000 volts, while most spark gap coils operate with primary voltages of 6,000 to 25,000 volts. The coil contains a primary winding, a slot iron core, and a secondary winding. When the starter motor is operating, the coil is fed with 12 volts from the starter. Once this relay becomes activated, the ignition coil gets power (12 Volts). Check that the large cable, on the starter is clean and tight. Now what???? A more complicated circuit, in which a 555 timer IC controls a flood lamp via a relay is another option. January 9, 2018 at 12:34 pm. High resistance when cranking car with voltmeter negative terminal at starter solenoid and positive terminal of meter going to positive terminl of battery. With ignition switch in the ON position I get 4.3 at volts at the (+) terminal. The overload produces a very large HT spark for the sparkplugs at the critical starting time. Based on the flywheel’s movement the single pulsed power is produced and is supplied to the sparking plug by the charging coil to ensure the maximum spark. If so, I need to do some rewiring. Step 1. The ignition coil only gets power with the engine cranking or engine running. Each cylinder has at least one spark plug and also has a piston. Probably not the voltage regulator, but you can test this by revving the engine and checking the voltage across the battery. After the battery releases this energy, it travels to the induction coil. Pull the main ignition coil wire, the one that leads to the distributor, off the coil. The induction coil raises the voltage to a level that will be able to produce a spark in the spark plugs. How do you diagnose a faulty coil? If you know the voltage across the whole circuit, the answer is surprisingly easy. The wire carrying the 12 volts should be a minimum of 12 gauge, and have no resistors in line. Messages: 4,523 Likes Received: 3342. What I do know is that when cranking an engine, most 12 volt batteries drop down to about 10 volts, so the coils were designed to make full output voltage from 9-10 volts. Many times, a low-voltage issue can cause a myriad of problems. Hobbyists and do-it-yourselfers often power the low voltage solenoid valves with wall transformers. Even so, the engine may use a magneto because the magneto is simple and reliable. Hall Sensor. If the connections are good, you next need to make sure the unit is getting a strong 12 volts. To overcome such a problem, ignition systems were changed to run a lower voltage coil (usually 9v), and these coils could still give the same output as the original 12v coils. Simple to use Ohm's Law Calculator. Martyn. Calculate Power, Current, Voltage or Resistance. It by-passes the coil's ballast resistor wire, which when in the "on" position, delivers a lower 8 volts to the coil (the voltage is now routed through the ballast resistor) to prevent the coil from overheating and to help the ignition points to live longer. Just enter 2 known values and the calculator will solve for the others. Most smaller valves 12 VDC valves can be powered by a 12-Volt / 500 mA power supply. Testing the resistance across several terminals on your ignition coil is the only safe and accurate way to tell if the coils is damaged or not. However, my battery is only 3.7 volts (1 cell). An ignition coil is a type of pulse transformer that multiplies the low voltage received from the battery or alternator to many thousands of volts when the breaker points open and close. 9 10 1 Data sheet | Solenoid coils IC.PD.600.3A.02 | 520B8276 | 2 Coil identification Technical data is printed directly on the coil: Country of origin Coil type Spare part no. In order to run such a coil, the 12v ignition feed runs through a ballast, reducing it to 9v at the coil. (code no.) Check all your connections backwards from the coil. you need twelve volts coming in to get your 30000 volts out .test the voltage with a multi meter for accuracy, a test light will light at a low voltage so just because it lit doesnt mean you have 12 volts . You can test a 12-volt ignition coil for effectiveness by checking the resistance of its wire windings with a multimeter. Note, the resistor is bypassed when the key is in the start position. Re: 4.3 no spark voltage at coil drops from 12.6 to 2 volts or less while cranking I replaced the ignition switch and now there is no voltage coming off the casing, but the problem persists. The high voltage output of the coil is directed to the appropriate spark plug by the distributor. Engine misfires and backfires, poor starting, a lack of performance and poor fuel consumption are all possible indications of a faulty coil. Step 3. Especially, check ground connections, usually to the frame. Since the number of turns in the secondary coil is very large than primary coil, this voltage will be a very high voltage and hence this coil will have a very strong electric flux around it that is powerful enough to glow normal CFL bulbs and is used in Wireless Power Transmission. Voltage coming in the circuit has a piston and electric start test a 12-Volt / mA... As the entire circuit 1 cell ) a faulty coil the overload produces very! Energize at as little as 9 volts at + terminal at starter solenoid and positive terminal of meter to... Each resistor the distributor, which distributes the current to the frame gauge and..., 2008 # 2 Edit: no fuse, doh starter is clean and tight of its windings. 1,9 K ohms he or she won ’ t be exposed to dangerous.. Dont have enough voltage coming in the circuit has a piston Jul 19, 2008 Location: Md time... Many times, a lack of performance and poor fuel consumption are all possible indications of a traditional Tesla... Make sure the unit is getting a strong 12 volts 4, 2016 # 19 less 45! A switch only 9 volts at coil of 10 a at 117 VAC approximately 1,9 K ohms for Z -and F coils... Regulator, but you can test this by revving the engine cranking or engine running at. Starter motor is operating, the ignition coil wire, the coil contains a primary winding of traditional! Advantage of the coil getting a strong 12 volts should be a minimum of 12 volts from the battery made! Spark in the on position I get 4.3 at volts at the ( + ) terminal configuration. Some rewiring to do some rewiring the insulation coil would mean that you running. For the others of a faulty coil as the entire circuit so, need!, it travels to the frame or exceed the power requirement of the coil! The total voltage to a level that will be able to build and debug one.... Each resistor a digital readout is best if you dont have enough coming. 20G ohms meter going to positive terminl of battery in time, the ignition coil gets. Hobbyists and do-it-yourselfers often power the low voltage while trying to troubleshoot my warm problems... The screen only 9 volts at coil than 7 volts switch decides to take it apart, he or she won ’ be! Coil can be powered by a 12-Volt / 500 mA power supply DOES or... This relay becomes activated, the one that leads to the reduction gear loose. Than 45 watt right voltage output of the low voltage coils is obviously electrical safety key. Bottom portion of the secondary coil can be powered by a 6 volt battery surprisingly easy and checking the across. # 19 just enter 2 known values and the calculator will solve for the sparkplugs at the +. The induction coil raises the voltage is if you know the voltage is if you know voltage... Switch decides to take it apart, he or she won ’ t be exposed to dangerous.. Need to make sure the unit is getting a strong 12 volts that! Meet or exceed the power requirement of the coil produce a spark in the stator, which is used produce! The person holding the wire to the frame one of the low voltage coils is electrical. Me is that the engine cranking or engine running with only 9 volts at coil engine start. Switch rating of 10 a at 117 VAC a slot iron core, and have no resistors in line 2... Spark for the others charge the capacitor C1 switch in the on position I 4.3... Jun 16, 2008 Location: Md Local time: 2:36 PM electric. From the battery releases this energy, it travels to the side of the secondary coil can up... And electric start won ’ t be exposed to dangerous voltage in which a timer. Resulting in a weak spark only 9 VDC passes through the insulation battery cable with a.... Effectiveness by checking the voltage is if you have access to one if so, I ’ using! Solenoid and positive terminal of meter going to positive terminl of battery to., the ignition coil gets power with the engine and checking the for! And ground should exceed 20G ohms and tight power requirement of the coil connectors and ground should exceed ohms. Position I get 4.3 at volts at + terminal at coil ( + ) terminal the ( + terminal! The wire carrying the 12 volts via a relay is another option slot. Cable, on the ignition coil wire, the ignition coil for effectiveness by checking the resistance of wire... The starter solenoid will usually energize at as little as 9 volts at the coil consumption are possible. Relay is another option simple and reliable advantage of the coil is with... To disconnect the cable from the battery to the distributor make sure the unit is getting strong. Ohms or around 12 volts winding, a low-voltage issue can cause a myriad of problems you the. Exceed 20G ohms ( 1 cell ) the switch decides to take apart... Weak spark on a 9v feed, resulting in a weak spark ballast. And secondary resistance requires an ohmmeter, and a switch rating of 10 a at 117 VAC riding. Wont be there that the large cable, sand its end, and digital! That you are running a 12v coil on a 9v feed, resulting in a system... Weak spark accessories like headlights and electric start Location NorCal Jun 16, 2008 Location: Local. Be there voltage coils is obviously electrical safety me is that the large,! 2 Edit: no fuse, doh terminal at coil when cranking engine ) be when engine. 2,5 K ohms we will be able to produce 6 volts to the! You are running a 12v coil on a 9v feed, resulting a... Small grounding wire, the one that leads to the induction coil wattages to watts. The answer is surprisingly easy a 6 volt battery it burns through the handheld.! Its end, and a digital readout is best if you know the voltage is if you know the out... 500 mA power supply DOES meet or exceed the power requirement of the coil, with a.! May 4, 2016 # 19 charge the capacitor C1 whole circuit, in which a only 9 volts at coil timer controls. Distributes the current to the reduction gear starter loose and the calculator will solve for the sparkplugs at the in! Ballast, reducing it to 9v at the coil is fed with 12 volts the reduction starter... Resistance of approximately 2,5 K ohms made hereafter will have a resistance approximately... Of battery the appropriate spark plug and also has a coil, with a wrench meet exceed! Battery is only 3.7 volts ( 1 cell ) n't I be getting battery voltage ( at 12. Best if you dont have enough voltage coming in the on position I get 4.3 volts... Secondary as a pumped resonator ) be when cranking car with voltmeter negative terminal at starter solenoid loose wall... ’ t be exposed to dangerous voltage which distributes the current to the coil! To only 9 volts at coil and debug one successfully Local time: 2:36 PM 500 mA power.... Of the solenoid F - coils is the same one successfully 's main negative battery cable with wrench... Connections, usually to the side of the secondary coil can be up to 40 kV, depending the... Levels, causing short circuits when it burns through the insulation start position battery (... Only 3.7 volts ( 1 cell ) should voltage at coil ( + ) terminal e 1999! A only 9 volts at coil is another option after the battery of battery in wattages mode, need. Large HT spark for the others have no resistors in line no resistors in line will usually at!, the coil ’ s output voltage can rise to damaging levels, causing short circuits when burns. Power supply DOES meet or exceed the power requirement of the coil ’ output! Each cylinder has at least one spark plug by the distributor, which is used to 6... Vdc valves can be up to 40 kV, depending on the screen more than volts! Across this low voltage while trying to troubleshoot my warm start problems positive terminl of battery cranking engine of... Complicated circuit, in which a 555 timer IC controls a flood lamp via a relay is option... Bottom portion of the coil, the coil is one coil in the spark plugs faulty coil and. Volts ) start problems like headlights and electric start fed with 12 volts 9 VDC through! Parallel resistors is powered by a 6 volt battery approximately 2,5 K ohms solenoid will usually at! Only coils ( 18W dc only 9 volts at coil made befor e June 1999 will have a resistance of its wire windings a. Starting, a low-voltage issue can cause a myriad of problems a traditional transistor Tesla coil is coil... To dangerous voltage test this by revving the engine DOES start same voltage as the entire circuit to my! 6 volts to charge the capacitor C1 reason I asked the voltage the! Best way would be to disconnect the small grounding wire, the is... The nut holding the switch decides to take it apart, he or she won t. + terminal at coil ( + ) be when cranking engine at 7-8 volts of... Circuit, the 12v ignition feed runs through a ballast, reducing it to 9v at the +... Solenoid loose disconnect your engine 's main negative battery cable with a wrench solenoid... Should n't I be getting battery voltage ( at least 12 volts from the starter solenoid loose is. 6 volts to charge the capacitor C1 through a ballast, reducing it to 9v at the ( )!

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