Question about 1979 Harley Davidson XLH 1000 Sportster

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No spark to coil and spark plugs motor does turn

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Does it have electronic ignition or points?
If it is a points system, If your points ore okay, set the point gap at .018. Also, make sure your kill switch is off. Some people have had a wire come loose from the kill switch.
If your problem is between the battery and the coil, You'll have to trace the wiring back from there and see what you see. The kill switch is a likely culprit.

Posted on Apr 03, 2014


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Posted on Jan 02, 2017


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Stihl fs 80 trimmer, replaced carb, air filter, spark plug, ignition coil. still doesn't start. Next? not getting spark from plug

Loosen coil screws, adjust coil to magneto flywheel magnets with a double sheet of common paper, tighten screws, so that paper will pull out without tearing. That will give you the best chance for a good spark, with all you have done. Pull spark plug out , put top of plug back in spark boot.......crank ovr with rope, and ground spark plug on top of motor(metal), observe the blue spark. If none, check the short wires for any breaks from coil to switch. You can open handle and take out switch, if nothing else works.....then try and start. The wires are just to break the ground, to turn off motor. Can choke motor to stop.

Jul 29, 2016 | Stihl Garden


Engine electricals

3) Spark: From battery to spark plug

The battery is the source of stored electrical power in the vehicle. A voltmeter between the terminals of a healthy battery should read 12.5 volts. A reading of 12.2 volts indicates a flat battery and a reading of 10.4 volts indicates a dead cell (each cell beingabout 2 volts). A battery should be capable of sustaining high current, as needed by the starter motor when turning the engine over. When the car is running the voltage measured across the terminals shouldbe between 14.2 and 14.5 volts. The value is the voltage being supplied to the battery by the output charge from the alternator. THis charging voltage should not alter much when additional load is applied to the battery (head lights on etc).
When the ignition key is turned to the second position,often referred to as 'key on engine off', all car functions are powered up including lights and fuel pump. When the key is turned to position 3 many ancillary functions are temporarily interrupted to allow the battery to meet the extra needs of the starter motor. Electrical charge from the starter switch passes through a master fuse and starter relay before energizing the starter solenoid. The starter solenoid moves the pinion gear on the starter motor to engage with peripheral teeth of the flywheel. Simultaneously, heavy copper contacts are bridged by this same movement causing the starter motor coils to become energized thereby turning the engine over.
During the ignition process electrical charge passes through the primary windings of the ignition coil(s). The engine control unit (ECU), taking signalsfrom the engine crank position sensor, collapses the field of the coil(s) appropriate to the cylinder requiring ignition. As the field collapses the secondary coil windings discharge very high voltage through the high tension lead to the spark plug. The charge is so high that at the spark plug gap the charge jumps across with a spark. The compressed fuel air mixture in the cylinder is ignited by this spark.
Checking the spark process starts with the plugs. The condition of the removed plugs reveals a lot about the nature of the ignition within the cylinders. Dark sooty deposits indicate overly rich fuel air mix and glazed plugs indicate overly hot lean mixtures. Removing the plugs (with the fuel pump relay unplugged) and holding the screw threads to the cylinder head whilst turning the engine over will reveal the quality of spark. The spark holders and leads should be examined for discharge through the insulation to the cylinder head. Removing the leads from the coil should reveal sparks emanating from the exposed connectors. Failure to see sparks at this point indicatesa failed coil (especially if neighboring coils show good spark) or a failed crank sensor if all coils show no spark.
NEXT 1.1 MAF Mass Air Flow sensor

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

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Getting a rapid misfire in cylinder 5 changed spark plugs ,cleared the code came back on the day later ???

Hi Jason, Sounds like you have a coil pack and one of your coils is faulty. To check which coil is faulty just pull a spark plug lead off a spark plug and plug the spark plug lead onto a SPARE spark plug, Now earth it to the CLEAN motor or body (make sure the spark plug is touching metal) Start the motor, it's going to run ROUGHER than usual but you'll see if that spark plug is sparking... If it sparks then that coil is good. Turn the motor off and replace the spark plug lead back on to the original spark plug. Repeat with the next spark plug lead and so on until you start your car and the spark plug doesn't spark, THAT'S YOUR FAULTY COIL...

Apr 14, 2016 | Cars & Trucks

1 Answer

Why does my 2009 2.0 dodge caliber only fire on the front two cylinders the first time I start it up and after I cut it off and back on only the back two cylinders fire

Hi anonymous, the link below is a short youtube video on how to replace your coils....If you don't know which coils are faulty just pull a spark plug lead off a spark plug and plug the spark plug lead onto a SPARE spark plug, Now earth it to the CLEAN motor or body (make sure the spark plug is touching metal) Turn the motor over using the ignition, If the spark plug doesn't spark then replace that coil.....CHEERS..

Mar 27, 2016 | Dodge Cars & Trucks

1 Answer

Like to locate fuel switch engine turns not getting gas

Oh, Hi David it's either fuel or spark... To check for spark just pull a spark plug lead off a spark plug and plug the spark plug lead onto a SPARE spark plug, Now earth it to the CLEAN motor or body (make sure the spark plug is touching metal) Turn the motor over using the ignition, If the spark plug doesn't spark then it could be coil... If it's sparking then you have a fuel problem, The fuel pump is usually in the fuel tank BUT I have no idea about the year, make or model number your car is....CHEERS..

Mar 27, 2016 | Cars & Trucks

1 Answer

Where is the 5th coil pack located on a 2005 buick rendezvous?

Hi patricia, If you have a faulty coil and your car's running rough to find the faulty coil just pull a spark plug lead off and start your car, If it runs (ROUGHER) than before then that coil is ok. Turn the car off and replace that spark plug lead back on to the spark plug. Repeat with the next spark plug lead and so on until you start your car and it runs the same as if THAT spark plug lead is on or off, NOW TO MAKE SURE THIS IS THE FAULTY COIL, Put a spark plug into the spark plug lead that's off and earth it to the motor or body (it has to be touching steel), Start the motor and if that's the faulty coil the spark plug won't spark I hope this helps.....

Mar 25, 2016 | 2005 Buick Rendezvous

1 Answer

Hi there, i have placed new coils and spark plugs also got new air-flow meter sensor new battery and car does not crank over please help

Hi does the motor turn with key but doesn't start?, If so take a spark plug out and replace it back into the spark plug lead and earth it onto a steel part of the body(make sure it's touching something steel). Have somebody turn the key to see if your getting spark. If you have spark then you have a fuel blockage but if you don't have spark but have new coils and battery then it could be a loose wire in the coil harness meaning electrical......
You say car does not crank over, If you mean you turn the key and motor doesn't turn then it's electrical, so no spark OR motor doesn't turn you're better off getting an auto electrician but if you have spark it's fuel problem and you need a mechanic... Sorry and good luck......

Mar 12, 2016 | 2002 Mazda Tribute

1 Answer

Cranks no spark from coil packs had ignition module checked .its ok changed crank and cam sensors still no spark?

Mate i had the same problem with my car, turned out to be a loose wire in the coil harness.... Pull a spark plug out and plug it back into the spark plug lead, then earth it to the body, Get somebody to turn the motor over whilst you move the coil harness around and see it you can get a spark then, Best of luck.....

Mar 11, 2016 | 1998 Buick LeSabre

1 Answer

Sears tractor cuts out while cutting grass like somebody turns the key off

Could be a failing ignition coil,i have seen a tractor start right up and runs,until the coil heats up from the motor. When this happens the motor dies,do to the coil not producing spark to the spark plug. You didn't mention if the tractor's motor was restarted right after it quit running or was it left until later when you attempted to restart the motor allowing the motor to cool. However,how old is the spark plug? If the spark plug is old,the plug will start failing,do to heat also. I would try a new right type spark plug,make sure the gap is set correctly according to your Owner's Manual. I have found that the gap on some new plugs,not set correctly,when it comes right out of the box. You can check the plug,by turning the motor by hand to see if there is a spark,turn on the ignition switch first(DO NOT USE THE START POSITION) when doing this,the tractor just might crank over,will not start if the plug is out.(But your hand could be injured). Check for a bright spark,if there is one,install the plug then try starting the tractor,in the start position. If you,have checked,what i suggested and everything is good-to-go. The tractor should start and run,like a new tractor. One more suggestion,check the fuel filter,while your down,this maybe or maybe not be the problem,doesn't hurt to check it. Sincerely,Brad Locke. DTD. 12/03/15

Sep 06, 2013 | Sears Garden

1 Answer

1998 gsxr 600 no spark


Verifying the Spark

Remove the upper and side fairings, using a 4 mm Allen wrench to unscrew the fairing bolts. Unlock and remove the rider's seat, using the ignition key.

Pull the fuel lines off of the fuel valve under the left side of the fuel tank. Unscrew the pair of bolts from the base of the fuel tank, using a 10 mm socket. Pull the fuel tank to the rear of the motorcycle to remove it..


Pull the cables off of the two spark plugs on the right side of the motor. The spark plug cable furthest to the right is connected to the right ignition coil, while the second cable is connected to the left ignition coil. Unscrew the spark plugs from the motor, using a spark plug socket. Plug the ignition cables back onto the removed spark plugs.

Hold the spark plugs against the motor and start the motorcycle for a few seconds. Observe the gap between the electrode at the tip of both spark plugs for spark. Ideally, the spark should have a bright, blue appearance.

Replace the spark plugs with new DR8E spark plugs, if no spark is present. Repeat the test. Replace the corresponding ignition coil if there is still no spark present at the spark plugs' electrodes.

Proceed to Section 2 for further diagnosis, or reassemble the motorcycle following the reverse method of removal.
Testing the Windings

Remove the suspect ignition coil from the motorcycle's frame, using a 10 mm socket. Unplug the coil's cables from the remaining spark plug in the motor and from the spark plug removed in Section 1. Unplug the motorcycle's wiring harness connector from the back of the ignition coil. Remove the remaining ignition coil, if needed, using the same procedure.

Set your multimeter to read an R X 1 resistance range, using the meter's settings dial.

Measure the ignition coil's primary winding at the terminal that connects to the motorcycle's wiring harness, using your multimeter. Touch the meter's red probe to the coil's positive (+) terminal and the black probe to the coil's negative (-) terminal. Take note of the measurement on the meter's display. Replace the ignition coil if its primary winding has a resistance measurement less than 3 ohms or greater than 5 ohms.

Set your multimeter to read an R X 1,000 resistance range, using the meter's settings dial.

Measure the ignition coil's spark plug cables, using your multimeter. Touch the meter's probes to the metal connectors within the cable's end caps. Take note of the resistance measurement on the meter's display, indicated in ohms. Replace the ignition coil if the cables have a resistance measurement less than 25,000 ohms or greater than 45,000 ohms.

Reinstall the ignition coil if its primary winding and spark plug cables are within the specified resistance range, using the reverse method of removal. Replace the entire ignition coil if either the primary winding or the spark plug cables are within specification, as the ignition coil and its cables are a combined assembly.

Reassemble the motorcycle following the reverse method of removal. Connect the left ignition coil's cables to the pair of spark plugs in the middle of the motor's cylinder (#2 and #3), while the right coil's cable connect to the spark plugs on the sides of the cylinder (#1 and #4).

Jan 11, 2013 | 1998 Suzuki GSX-R 600

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