Question about Harley Davidson FLHT Electra Glide Standard Motorcycles

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Neutral safety switch wiring problem for my 1972 FLH harley davidson

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  • Harley Davidson Master
  • 43,120 Answers

Hi Duane_smith2, for a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

Posted on Jun 21, 2015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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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: 1972 shovelhead harley-davidson engine rebuilt

Thirty over is nothing. I just finished a rebuilt on a 1970 model and we went 0.050" over on it. It was already at 30 over and the pistons scored.

Anyway, don't use one of these cheap Chinese made bendix's. Get an ACCEL. They may be made in China but they're better. You can't get good Shovelhead parts anymore.

Now, before you put the outer primary back on, use your hand and operate the fork that shifts the bendix into engagement with the ring gear. Does it engage like it's supposed to. You'll probably have to turn it just a bit. Now, do it again with the outer primary on. Does it still engage smoothly?

Now, here's the cause of most starter grinding problems on a shovel. The starter, ring gear, and outer primary are all out of alignment. The starter housing, the one with the big gear in it is supposed to have alignment pins in it as well as the outer primary. These pins are to ensure that the starter drive and the ring gear are properly aligned with each other. With the starter and outer primary on, you should be able to pull on the plunger of the solenoid and the starter drive engage fully and smoothly. Also don't forget the large brass washer. This keeps the drive from going too far.

If you're worried about low voltage, take the battery to an automotive parts store and ask them to load test the battery. If it drops below 10 volts, buy a new battery.

Posted on Aug 18, 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

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