Question about 2004 Harley Davidson FLSTF - FLSTFI Fat Boy

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2007 Harley Davidson FLSTFI Fat Boy the main fuse link keeps blowing

2007 Harley Davidson fat boy, positive side grounded at the main fuse link, it's not ignition switches, voltage regulator or stator, any other ideas will be helpful. @

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  • Harley Davidson Master
  • 54,661 Answers

Hi, Stanley before diagnosing your blown fuse issue, check the bottom of your seat, if its metal and comes in close proximity to the positive battery post you need to take the necessary steps to ensure there is no contact (electrical tape, thick rubber insulation, hammer a dent in the seat bottom etc.) You are going to need a wiring diagram from your service manual, a test light, an ohmmeter and plenty of extra fuses.
If you turn on your ignition switch and immediately blow a fuse you have a hard/dead short and is usually easy to find. With a test light connected to the hot side of the blown fuse holder start stabbing the wire/s that leads away from the fuse holder and towards the ignition switch, you test light will illuminate validating the short. When the test light fails to illuminate you have passed the short and need to back up until the test light illuminates, then look in the immediate area for the short.
If you driving down the road for 30 minutes or 15 miles and blow a fuse you have soft/flying short and may take some time and patience to find.
If the main fuse/circuit breaker constantly blows/trips while riding you probably have a faulty battery terminal connection. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary. Any other fuses that constantly keep blowing while riding are usually caused by a loose or corroded ground wire in the circuit, which means you have to check, inspect, test each and everyone with an ohm meter set on a low ohm scale 100 ohms or less . Simply touch one lead to the ground source and the other lead to the battery negative terminal, a reading of zero indicates a clean solid ground. Any reading or infinity indicates a poor ground and needs to be repaired. Poor or weak grounds require excessive additional amperage to complete the circuit which in turn blows the small amperage fuse.
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.
https://www.hdtimeline.com/threads/maxi-fuse-keeps-blowing-any-ideas.53755/
http://www.mediafire.com/file/lbs9ej75cinadd3/2007+Harley+Softail+Service+Manual.pdf
http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
https://ownersmanuals2.com/harley-davidson/fat-boy-2007-owners-manual-66494
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Posted on Jan 29, 2019

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Posted on Jan 02, 2017

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SOURCE: 2006 Harley Davidson- No tach, speedo, blinkers

ckeck your fuse block

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wd4ity
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SOURCE: my 2006 fuel injected fat

As far as I know, ALL alternators are variable output to a certain extent. Not as bad as a generator but still, if you connect a volt meter to the output of an alternator and vary the speed at which it's running, the voltage will vary. There are other voltage regulators that will work on your bike. Custom Chrome's brand is C.C. Rider and Accel makes them as well. They cost as much as the OEM regulator but in my experiences, they don't last as long either. Does made in China mean anything to you? Not trying to be a wise acre here just trying to point out that quality isn't cheap and in that area, I've had much better luck with genuine H-D parts.

Good Luck
Steve

Posted on Sep 03, 2010

bdrew1340
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SOURCE: how to convert standard to synthetic oil in all three chambers of a 2007 harley-davidson fat boy

Drain all the oils. Replace the oil filter. Fill all three cavities with synthetic oil.

Posted on Aug 07, 2012

gregg201
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SOURCE: I need a wiring diagram for a 1997 Harley Davidson Fat Boy, when I start my bike the speedometer and mileage counter do not work.

Hi Chance, www.officialharleyparts.com

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Apr 12, 2015

gregg201
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SOURCE: 2005 Harley Davidson FLSTF - FLSTFI Fat Boy engine starts on accessory switch position

Hi, Ron you may have a faulty or dirty (contaminated) ignition switch try cleaning if possible 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 $10 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.
2001 Fatboy dead no power when ignition switched on Harley Davidson Forums
Harley Davidson Softail Workshop Service Repair Manual 2005 $10 cheap
http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
http://mybikemanuals.com/harley-davidson/2005-harley-davidson-owners-manuals
Instant Tech Relief To speak to me personally absolutely "FREE"

Posted on Sep 22, 2017

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