Question about Harley Davidson FXDL Dyna Low Rider Motorcycles

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I have single fire ignition and I got no spark. It has dyna coils and on a 1981 80 ci lowrider white lead is on back side of coil black lead is on front side outside coil and reds strap front to back of the 2 coils. Where do i look for power?

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The coils primary circuit terms. should be labeled "+" and "-". With key on check for 12v @ wire to "coil +" and "coil -" grounds through points. When ground's removed (points open) magnetic field collapses inducing high voltage (spark) in "secondary" circuit.

Posted on Apr 28, 2010

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1 Answer

Getting no fire to the spark plug


What year is it???

A simple coil test is: Take the plugs out of the cylinder heads and lay them back on it so that they have a good ground. Then watch the spark plugs closely when you turn the ignition switch off. You should see a single spark on each plug. This tell you that the coil is getting fire and that it is good and your problem lies elsewhere.

Otherwise,
Test the primary coil resistance on your coil. Disconnect all the wires going to the small terminals (primary) on your coil. Using a good ohmmeter on Rx1 setting, test the resistance between the two small terminals. You should read somewhere between 2 and 3 ohms. If you read more, the coil is bad. Before you do this test short out both leads of the ohmmeter and if the reading is not zero you will need to write down or otherwise remember the number and subtract it from the reading you get from the primary circuit test or you will have an incorrect resistance reading for the primary wires because you will also be reading the ohmmeter internal resistance and/or the wire and lead resistance added to the primary wiring resistance.

You can also test the coil by leaving the "hot" wire on the coil and replacing the other side (ground side) with a short piece of wire. Turn the ignition on and temporarily ground the short piece of wire you put on the "out" (ground) side. When you take the wire away from the ground, (which will collapse the primary current into the secondary) you should see a spark at the plugs if it is a wasted spark system or at one of the plugs if it is not a wasted spark system. If you have current to both sides of the primary of a two part coil both plugs should get a spark whether wasted spark system or not as you are energizing both sides of the primary and collapsing both into both secondaries at the same time when you remove the ground wire from the cylinder head ground.

Sep 14, 2014 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

My 2000 dyna lowrider want idle and skips and pops when riding


Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley... Good luck

Feb 04, 2014 | 2000 Harley Davidson FXDL Dyna Low Rider

1 Answer

I replaced the battery on my 1998 lowrider. The battery cranks like crazy but no spark. I need to know if all wires are hooked up correctly. DeeQ


Does any of the other lights on your bike light up? If so, you've probably got all the wires connected but I'm not sure if they're connected correctly. Check your fuses. The ignition circuit has it's own fuse that is separate from the lights and stuff. Seems like I remember that the "hot" wire to the coil on your bike is white in color. turn the switch on and check for voltage on the white wire. Take the plugs out of the cylinder heads and lay them back on it so that they have a good ground. Then watch the spark plugs closely when you turn the ignition switch off. You should see a single spark on each plug. This tell you that the coil is getting fire and that it is good and your problem lies elsewhere.

Good Luck
Steve

Apr 22, 2011 | Harley Davidson FXDL Dyna Low Rider...

1 Answer

I have a first generation 83 yamaha venture 1200 v 4 i have power to only 3 of the ignition coils the fourth coil has tested good by taking #3 lead and plugging into #4 coil. any ideas on what part to...


Okay...when you say power to the coil...I think you mean getting a spark on the plug wire?

All 4 coils should have battery voltage on the red/white wire to each coil. The second wire returns to the igniter (TCI....ignition black box) and it switches that wire off and on to ground to cause the coils to fire. If all 4 test good...then
Check out the TCI, the large box mounted on the coil rack that the connectors are clean.
Now remove the 6 wire connector from the TCI...and test the resistance of the pickup coils which are located under the left crankcase cover beside the stator coil.
you will be testing the following wire pairs on the 6 wire connector
Orange-Black
White/Red-Black
Gray-Black
White/Green-Black
You should see at ambient engine temp...about 110 ohms resistance on all 4 pairs.....if one pair is showing no resistance...you need to test at the lower 5 wire connector just below the seat left side with the same 5 colors....unhook and test....if still having one bad test...pickup coils may be bad.

Apr 10, 2011 | Yamaha Royal Star Venture Motorcycles

1 Answer

I have a 1979 harley sportster and have switched it over to an electronic ignition module (Dyna S) dual fire. I have a drag specialties dual fire coil with two poles (for the wires coming from the...


The original wires, one blue and one white, were with the points ignition. The white wire should be the "Hot" wire. Now, look at your wiring diagram. The two white wires should go together to one side of the coil and the blue to the other. There is no positive or negative side of the coil, just two small primary winding terminals. Make sure the white wire from the ignition system is the "hot" or power wire for 12 volts. If you connect the ignition unit up backwards, it will damage it. To make sure the white wire on the bike is the hot wire, simply turn the ignition switch on and check this wire with a test light or volt meter. It should show battery voltage on it. That should be your setup, two white wires on one end of the coil and a blue wire on the other.

Good Luck
Steve

Nov 16, 2010 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

94 Fatboy, I replaced the coil and ignition, still no spark in the rear cyl, top winding. This bike is a Calf. model. Thanks ............ Dennis Sailor. Cocoa Fl. Steves Cycles...........


By the way you're talking, the bike is equipped with a single fire ignition. Your use of the term "top winding" indicates that there is a "bottom winding" or two windings on the coil. A single fire coil will have three small connections on it. A dual fire coil will only have two primary connections. In the dual fire system, both spark plugs fire at the same time where they fire individually on the single fire. Please check the ignition system out further and tell me if it's a stock ignition system or some type of aftermarket system. Either way, no spark to the rear cylinder indicates a bad ignition unit.

Good Luck
Steve

Nov 14, 2010 | Harley Davidson FLSTF - FLSTFI Fat Boy...

1 Answer

Had a ground short and was troubleshooting wires and tsm and ignition key plug....found short and reconnected everything and now no spark to the coils...could this be because i unplugged tsm and ignition...


No need to marry them for this reason, only if a new one was added. Is it really a 2002 as the category says as sometimes the category model year is not the correct year for the bike in question.

Test the primary coil resistance on your coil. Disconnect all the wires going to the small terminals (primary) on your coil. Using a good ohmmeter on Rx1 setting, test the resistance between the two small terminals. You should read somewhere between 2 and 3 ohms. If you read more, the coil is bad. Before you do this test short out both leads of the ohmmeter and if the reading is not zero you will need to write down or otherwise remember the number and subtract it from the reading you get from the primary circuit test or you will have an incorrect resistance reading for the primary wires because you will also be reading the ohmmeter internal resistance and/or the wire and lead resistance added to the primary wiring resistance.


You can also test the coil by leaving the "hot" wire on the coil and replacing the other side (ground side) with a short piece of wire. Turn the ignition on and temporarily ground the short piece of wire you put on the "out" (ground) side. When you take the wire away from the ground, (which will collapse the primary current into the secondary) you should see a spark at the plugs if it is a wasted spark system or at one of the plugs if it is not a wasted spark system. If you have current to both sides of the primary of a two part coil both plugs should get a spark whether wasted spark system or not as you are energizing both sides of the primary and collapsing both into both secondaries at the same time when you remove the ground wire from the cylinder head ground.


Take the plugs out of the cylinder heads and lay them back on it so that they have a good ground. Then watch the spark plugs closely when you turn the ignition switch off. You should see a single spark on each plug. This tell you that the coil is getting fire and that it is good and your problem lies elsewhere. You get a spark on both plugs because it is a wasted spark system that fires both plugs simultaneously, one on power stroke and the other on exhaust stroke.


This will not work on 2006 etc EFI as there will be no spark with both plugs removed.

POST a comment if you need more assistance and ALSO PLEASE post one with the solution you find so others will benefit from shared information.

Oct 19, 2010 | 2002 Harley Davidson FXD Dyna Super Glide

1 Answer

Rear cyclinder is running rich,blows black smoke,This is an 80 in. new build,ported heads,three angle valve grind,EV 27 cam,I've tried every jet combo in 2 S&S ''E'' carbs,one brand new,Tried Dyna S...


Hi Woodwerkjerk, I,m leaning towards an electrical issue, try swapping spark plugs and do a resistance test on your spark plug cables and ignition coil. Good luck and have a nice day.

Jun 19, 2010 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

Rear cyclinder is running rich,blows black smoke,This is an 80 in. new build,ported heads,three angle valve grind,EV 27 cam,I've tried every jet combo in 2 S&S ''E'' carbs,one brand new,Tried Dyna S...


Hi Woodwerkjerk, and the usual suspects are:
1. Plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discarged.
6. Damaged wire or loose connections at battery terminals especially the ground cable at BOTH ends, ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. If your bike has a CKP sensor you must leave both plugs in
head and check for spark with a 3rd plug. Good luck.

Jun 19, 2010 | 2000 Harley Davidson FXST Softail Standard

1 Answer

Gsxr 750 no spark how do i test cdi


I've this data from my 1986 engine!

Under the left hand side cover there are 2 2-wire connections. One with a green and a black wire, one with a blue and a yellow wire.
Use an ohmmeter at R x 100 between both wires of a connector to check the pick-up coils: resistance must be between 130 and 180 Ohms.

The values of the ignition coil resistances are:
primary coil : 3-5ohms ( set ohmmeter at R x 1 )
Secundary coil : 25.000 - 45.000 ohms ( set ohmmeter at R x 1.000 )
For a correct measurement ALL leads must be disconnected ( also the spark plug leads )

The CDI cannot be tested with a simple measurement. Suzuki dealers have a special tool to test CDI boxes.
But checking the pick-up coils and ignition coils good will indicate an defective CDI.

The wires on the CDI:
Blue: PU coil 1 ( cyl 1-4 )
Yellow: PU coil 1
Green: PU coil 2 ( cyl 2-3 )
Blue : PU coil 2
Orange/white : +12v ign coil 1-4
White : switched coil negative side ign coil 1-4
Orange/white : +12v ign coil 2-3
Blue/yellow: switched coil negative side ign coil 1-4 ( and signal to tachometer )
Blue/white : ground

Thus, you must have +12V on both Orange/white leads.

Mar 15, 2009 | 1992 Suzuki GSX-R 750 WN

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