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Power source to ignition coil

Where is the power source to the ignition coil?

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It depends on the design of the motor. some older ones are points and condensor and newer ones are ignition modules and there are even some that are a combination of the two. there is also a part called a stator that is part of this system. most of these parts are under the flywheel and require meters and specs to test them. the first thing is to see if you are getting spark at the plug wire with an inductive timing light you put around a plug wire while you turn the motor over. if it flashes you are getting spark. good luck.

Posted on May 30, 2010

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1 Answer

Ignition coil getting no power steering wheel not locking turns over no start


The power to the coil via relay is activated by the ignition switch which doesn't lock the the steering column. That could be the source of all these problems. Also check the fuses.

Jul 14, 2015 | 1996 Dodge Caravan

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Engine wont start


Engine does not crank (Does not start)
1. Starter and starter relay
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No initial combustion (Does not start)
1. ECM power source circuit
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Jul 30, 2013 | Toyota Corolla Cars & Trucks

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How does solid state ignition work


Its a magneto. Requires no outside power source. Remove the black wire from the ignition coil and check for spark. If you have spark the coil is good if not then the coil needs to be replaced. Otherwise your problem is elsewhere.

Oct 24, 2012 | Tecumseh Garden

1 Answer

SKIPPING PROBLEM . SPARK PLUGS & WIRES HAS BEEN DONE. THERE'S NO 12 VOLTS AT THE COIL CONNECTOR PLUG WITH THE KEY ON. LYMAN


Sound like a ground problem; the fastest way to identify the Power and Ground Circuits is using a wiring diagram. If you don't have one you'll have to find out by trial and error as you probe each circuit.

The power circuit is tested with the Key On and Engine Off. Place one end of your multimeter or Test Light on the Battery Negative Terminal and with the other end, probe the Power Circuit. Turn the Key to the Run position. If the Power Circuit is OK, the Multimeter will show 12 Volts or the Test Light will light up. Here are the possible results:
* You got 12 Volts on the Power Circuit
Good, this is a good sign. The next step is to check the Ground Circuit of the Coil on Plug connector that you're testing.

* No Power in only one Ignition Coil
Without 12 Volts, the Coil-on-Plug Ignition Coil will not work, thus you have just eliminated that specific Ignition Coil as the source of the fault. Replacing the Ignition Coil with a new one will only be a waste of time and money since, without Power the new one will not Spark.
Since the Power Circuit is shared by all of the coils on the majority of Coil-on-Plug Ignition Systems. The most likely cause will be an open short in that Ignition Coil's Power Circuit.
You'll have to consult your Repair Manual's wiring diagrams to make sure how everything is wired up.
After repairing the short, re-do the Spark Test to verify the Ignition Coil is now working.

* No Power at any Ignition Coils
The fuse or relay that supplies this voltage is blown or BAD.
You'll have to consult your Repair Manual's wiring diagrams to see where this fuse and/or relay is located and replace as necessary.
After replacing the blown fuse or the defective relay. Retest the Ignition Coil.

Them, the Ground Circuit is tested with the Key On or Off. It doesn't matter because this is a Chassis Ground. Place one end of your multimeter or Test Light on the Battery Positive Terminal and with the other end, probe the Ground Circuit. If the Ground Circuit is OK, the Multimeter will show 12 Volts or the Test Light will light up.

* You got Ground
Good, now the next step is to verify that the Coil-on-Plug Ignition Coil is receiving the Triggering Signal. This info belongs to the next section of this article.

* No Ground in only one Ignition Coil
Without this Ground, the Coil-on-Plug Ignition Coil will not work, thus you have just eliminated that specific Ignition Coil as the source of the fault. Replacing the Ignition Coil with a new one will only be a waste of time and money since, without Ground the new one will not Spark.
Since the Ground Circuit is shared by all of the coils on the majority of Coil-on-Plug Ignition Systems. The most likely cause will be an open short in that Ignition Coil's Ground Circuit.
You'll have to consult your Repair Manual's wiring diagrams to make sure how everything is wired up.
After repairing the short, re-do the Spark Test to verify the Ignition Coil is now working.

* No Ground at any Ignition Coils
This usually happens thru' human error in most cases and is a very rare thing. Usually the engine was replaced and this ground was not re-attached.
You can Ground this circuit with a jumper wire. Jumpering to Ground just one Coil-on-Plug Ignition Coil should provide Ground to all of them (consult your Repair Manual's Wiring Diagrams to be sure).
With this jumper wire to Ground attached, crank the vehicle.
If in fact the Ground Circuit does have an open short, this (the jumper wire to Ground) should make the vehicle start, or at least get the Ignition Coil to Spark.
Repair the open short and retest for Spark or retry starting the vehicle.


Hope this helps. Keep us updated.

Aug 19, 2011 | 2003 Chrysler Town & Country

1 Answer

1995 plymouth van 3.3 has no spark but geting lots off gas what could it be and no power going to the coil


check the fuses for the ignition system if its good then you may have a problem with the computer controlling the ignition system.as i believe it control the power to the coil(?).if you feed battery voltage to the power side of the coil will it start.if so then you will have to trace the wire back to its source to find the problem(it may be feed from the ignition switch instead).you may have to go to a shop that has the test equipment to check out the computer system to find the problem.

Apr 16, 2011 | 1995 Plymouth Voyager

2 Answers

I have a 1968 F100 to start 1 wire to the solenoid the other to the coil? Please help


Um, I am not sure what you are asking, but there is a resistor bypass wire that goes from the starter solenoid to the coil. The reason is during starting not enough power gets to the coil through the resistor. After start, the resistor power source is enough, and the direct connect power (from solenoid) would burn out the coil.

Oct 04, 2010 | Ford F-100 Cars & Trucks

2 Answers

I have A 1991 GMC SIERRA, 350,no fuel no spark, have fuel to the tbi, changed coil, ignition module, tested pick up coil good, check engine light comes on with key, fuses good. I'm running out of ideas....


Do you have power to the injectors? One of the wires to the injector will come on for a couple seconds as soon as you turn the key to the on position.The computer controls the ground side. If you do not get power to one of them start looking for an open circuit. The same power source will also go to your ignition coil and ignition module. If you do not have power on the pink wire to the coil apply a temporary fused battery power source to it and give it a try, this will also power up the injectors.
Check it out and let me know.

Oct 29, 2009 | 1991 GMC Sierra

1 Answer

1988 cherokee no power to coil


I'd try an ignition module based upon what you have already replaced. Depending upon which engine you have and what month it was assembled, You could have one of several ignition systems (seems like they were using up whatever was on the shelves) any diagrams are cryptic as to any relays used etc. I'd try that, then physically begin tracing the coil power back to it's source. Actually, the car is old enough that I might even consider building my own ignition system and discarding the junk they used when they built it! But, that's somewhat complicated.

Jun 28, 2009 | 1988 Jeep Cherokee

1 Answer

Where is the ignition power source under hood in 94 chevy 1500?


The coil, one is a constant 12v source, the other is a remote ignition source.

Apr 28, 2009 | 1994 Chevrolet S-10

2 Answers

Will not turn over


1 Inspect Battery Damaged or faulty battery and/or connections. grey_line.gif 2 Inspect Coil - Ignition Damaged or faulty ignition coil or ignition coil circuit. grey_line.gif 3 Inspect Fuel Filter Clogged or dirty fuel filter grey_line.gif 4 Inspect Fuel Injector Pressure Regulator Faulty fuel injector pressure regulator or circuit. grey_line.gif 5 Inspect Fuel Pump Improperly functioning fuel pump or circuits. grey_line.gif 6 Inspect Wireset Damaged, worn, or deteriorating spark plug or coil wire(s). grey_line.gif 7 Inspect Control Module-Ignition Faulty ignition control module or circuit. grey_line.gif 8 Inspect Solenoid Switch Damaged or faulty solenoid switch or solenoid switch circuit. grey_line.gif 9 Inspect Starter Damaged, worn, defective, or faulty starter or starter related circuit. grey_line.gif 10 Inspect Neutral Safety Switch Damaged or faulty neutral safety swittch or circuit. grey_line.gif 11 Inspect Fuse Corroded, burned, or shorted fuse may be interupting power source. grey_line.gif 12 Inspect Fusible Link Corroded, burned, or shorted fusible link may be interupting power source. grey_line.gif 13 Inspect Battery Cable Corroded, broken or poorly connected battery cable. grey_line.gif 14 Inspect Spark Plug Wire Loom - Performance Improperly adjusted or worn/malfunctioning carburetor. grey_line.gif 15 Inspect Distributor Cap Loose or cracked distributor cap grey_line.gif 16 Inspect Distributor Cap And Rotor Kit Loose, cracked, or worn distributor cap and ignition rotor. grey_line.gif 17 Inspect Fuel System Pressure Incorrect fuel pressure being delivered to carburetor or fuel injection system. grey_line.gif 18 Inspect Fuel Injector Plugged, dirty or poorly connected fuel injector. grey_line.gif 19 Inspect Ignition Switch Worn, damaged or faulty ignition switch or circuit. grey_line.gif 20 Inspect Spark Plug Fouled, damaged or broken spark plug(s). grey_line.gif 21 Inspect Belt Incorrectly routed, adjusted(tensioned), missing or worn drive belt(s). grey_line.gif 22 Inspect Timing Belt Slipped or broken timing belt. grey_line.gif 23 Inspect Timing Set Slipped timing chain or worn timing gear(s). grey_line.gif 24 Inspect Fuel Tank Contaminated fuel from rusted or deteriorated fuel tank. grey_line.gif 25 Inspect Ignition Timing Incorrectly adjusted engine timing. grey_line.gifHERE is a list of thiung to check and ur car should fire right up Shaun

Aug 07, 2008 | 2000 Chevrolet Impala

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