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1977 Harley Davidson FLH wiring diagram - Harley Davidson Motorcycles

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  • Harley Davidson Master
  • 39,932 Answers

Hi, Kevin for this scenario you will need your service, parts fiche, and owners manual if you can not find the best tool you ever bought for your Harley, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
http://www.officialharleyparts.com/harley/1978-83_fl.jpg
https://www.carlsalter.com/pdfs/Harley-davidson-1970-78%20Electra%20super%20Service.pdf
http://www.harleyclasica.es/wp-content/uploads/manuales/1941-84-HD-FL-FLH-Parts-Catalog.pdf
http://www.harley-davidson.com/content/h-d/en_US/home/owners/maintain-your-bike/owners-manual.html
Instant Tech Relief To speak to me personally absolutely "FREE"

Posted on Aug 11, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

isaid
  • 302 Answers

SOURCE: wiring diagram 1966 flh

your local harley dealer parts dept.should print one up for u free of charge

Posted on Oct 06, 2009

wd4ity
  • 4565 Answers

SOURCE: I need a wiring diagram for a electronic ignition module.

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

wd4ity
  • 4565 Answers

SOURCE: need wiring schematic for 72

I can send you a schematic if you'll contact me off forum. This forum will not allow me to send a file any larger than 150 Kb. I'll send it to you as a JPEG picture file. Contact me at wd4ity@bellsouth.net and tell me what you need.

Good Luck
Steve

Posted on Sep 29, 2010

bdrew1340
  • 448 Answers

SOURCE: how to change the cam in a 1977 flh harleydavidson shovelhead

Get a service manual. The job is too involved for a solution here. The manual will give you all the specs and info you will need to do this job.

Posted on Aug 26, 2012

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%21cb1i,k%21bmk%7e$%28kgrhqyokiqez9u7gqkhbnjkdpodvq%7e%7e_12.jpgs.gifSell one like thisHarley-Davidson FLH, FLT Touring Series Repair Manual 2006-2009

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