Question about Harley Davidson FLHT Electra Glide Standard Motorcycles

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I need a wiring diagram for a electronic ignition module.

I need a wiring diagram for my1979 Harley
Davidson FLH electriglide's electronic ignition module

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  • sweeticandyb Jul 04, 2010

    What I'm looking for is a wiring diagram from points to ignition ... ???? No one seems to know.

  • sweeticandyb Jul 04, 2010

    What I'm trying to find out is how to take the points to electronic ignition ???? Help no one knows

  • Rob E. Martin
    Rob E. Martin Dec 04, 2013

    its not difficult get a compu-fire,ultima ignitions are good and affordable,Dyna's good and nothing to install.

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  • Master
  • 4,565 Answers

If I understand correctly, Your bike has points in it now and you want to go to electronic ignition. If that's what you want to do, I would suggest that you go with one of the aftermarket ignition units. They're more versatile, costs less, and easier to install.

There are two types available. Your bike has a mechanical timing advance unit behind the points breaker plate. One type of electronic unit eliminates this mechanical part and makes the system truly maintenance free while the other type retains the mechanical advance unit and cost less. A prime example is Crane Cam's HI-1 unit that retains the mechanical advance and their HI-4 unit that eliminates it. Most bikes made after 1984 do not have the mechanical advance units. Since your bike does not have any of the original components left on it, I would suggest that you get one of the units that goes in the "nose cone" of the engine. It simply replaces the everything in there if you get the unit that does not use the mechanical advance. The Mechanical advance units are prone to wear and since no one ever services them, I'd suggest getting rid of it. You'll have to purchase a "timing cup" from Harley, costs about $20, a lot less than $100 bucks for needle bearing mechanical advance unit. Get the shorter screw that goes with it as well.

All you have to have with either unit is a "hot" wire going to the coil. The coil must have a primary resistance of somewhere around 3-4 ohms where a points type coil has a primary resistance of 4-6 ohms. To determine the resistance of your coil use a Digital Volt Ohm Meter and measure the resistance between the two small terminals on the coil. To wire the ignition units is usually just a two or three wire hookup that is very simple. They all come with wiring instructions.

Now, the next thing is whether you wish to stick with "dual fire" ignition or go to "single fire" ignition. Dual fire is the system that almost all Harley's come equipped with from the factory. In this type of system, both spark plugs fire when the pistons are top dead center. Since one piston is on the exhaust stroke, that spark is of no consequence and therefore is considered a 'wasted spark". In a "single fire" system, the spark plugs fire independently when each piston comes to TDC on the compression stroke. It requires either two coils or a "two in one" type coil. This added coil increases the cost of the system and to be honest with you, I cannot tell a difference between the two systems. With that in mind, I opt to go with the less expensive and simplier "dual fire" system.

http://www.cranecams.com/?show=browseParts&lvl=2&prt=4
http://www.compufire.com/harley-main.html
http://www.dynaonline.com/skins/harley_davidson_category.aspx

Custom Chrome online catalog. http://www.customchrome.net//icatalog/full.aspx?Page=571

Ok, this will get you started. Installing an electronic ignition system in an older Harley is easy to do. The difficult part is deciding which one to go with. Once you do that, no problem. If you have anymore questions, drop me a line at wd4ity@bellsouth.net .

To see how to hook up one of the units, go to their website and look for a "Technical" page. Go to that page and look for "installation Instructions". Print them out and it'll tell you everything you need to know. If not, I've got some different types of systems installation instructions that I can scan and send to you.

Good Luck
Steve

Posted on Jul 04, 2010

  • sweeticandyb Jul 08, 2010

    We would like to thank Steve for his patience with us and figuring this situation out.
    Because we already had the ignition Steve went out of his way to make sure we
    could understand, even in layman s terms. Again,... thanks alot Steve!

  • wd4ity
    wd4ity Jul 08, 2010

    You're so welcome. I hope you got your bike running and you many miles of enjoyment out of it. Ride Safely.



    Steve

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