Ignition Woes...
Road Warrior
Joined: May 2017
Posts: 1,343
Likes: 2,056
From: Phoenix
Make sure we're the voltage regulator mounts to the frame has a GOOD ground. No paint, no powder coat.
Harley voltage regulators shunt excessive voltage to the frame.
https://www.electricity-magnetism.or...age-regulator/
Harley voltage regulators shunt excessive voltage to the frame.
https://www.electricity-magnetism.or...age-regulator/
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,091
Likes: 7,611
From: Poolville
It's a new regulator.. I run a ground wire from the back of the regulator to ground.. I also check regulator to ground at various points through out the bike including to rocker cover bolts and clutch release cover bolts.. I have great continuity every where..
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,893
Likes: 8,002
From: poway
Make sure we're the voltage regulator mounts to the frame has a GOOD ground. No paint, no powder coat.
Harley voltage regulators shunt excessive voltage to the frame.
https://www.electricity-magnetism.or...age-regulator/
Harley voltage regulators shunt excessive voltage to the frame.
https://www.electricity-magnetism.or...age-regulator/
The is no such thing as shunting to the frame.. That is a single point.. Shunting requires 2 points.. What they do is shunt the output of the regulator.
The examples in that link are not what HD does. For one using a linear device dumps all the excess energy. This create an excessive amount of heat. Early English and Japanese bikes got away with it as they had marginal charing systems. Not a whole lot of power / current generated..
I believe that HD regulators use SCRs or Diacs to chop the output of the regulator.. @bustert has the schematics that are close.. The alternator is like a current source. Shorting the output dumps less power then trying to regulate it with a linear device and reference or Zener diode.
I've not seen regulators spike but I've seen them go high after some heat.. I would expect that loose component inside the device could cause spike tho.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,091
Likes: 7,611
From: Poolville
I honestly don't think that two regulators could be the cause.. I'm getting identical results with both with nominal output of 14.3.
Maybe it's just something within the speedometer head, I'll hook up another voltage regulator to see what that shows...
Maybe it's just something within the speedometer head, I'll hook up another voltage regulator to see what that shows...
Stellar HDF Member
Joined: May 2005
Posts: 2,137
Likes: 17
From:
I just skimmed through this quickly, so I'm sorry if I missed something, but I had a similar problem with an idiot shop on the road working on my FXRS. They had a Dyna ignition which required a 5 ohm coil instead of the usual 3 ohm for most Evo Big Twins. There were many other problems with their work, but when I got them sorted out at my home shop the bike ran fine for a short time and then just started backfiring and eventually would only run for a short time before it had to cool down before it would run again. They had sold me a new 3 ohm coil instead of the required 5 ohm. Just make sure you have the right coil.
HDF Community Team
Joined: Dec 2005
Posts: 5,402
Likes: 2,605
From: NC USA
mp, I know from another thread several months ago that he has a 3 ohm coil and it's an S&S - he posted a photo of it.
But that's good you brought it up because he's been thru many ignitions in a fairly short time and the only constant is the S&S coil.
Hotrod, easy as it is to change on that softail, why not put a stock coil on an run it on dual for for a while, see if the single fire coil is acting up.
But that's good you brought it up because he's been thru many ignitions in a fairly short time and the only constant is the S&S coil.
Hotrod, easy as it is to change on that softail, why not put a stock coil on an run it on dual for for a while, see if the single fire coil is acting up.
Last edited by t150vej; Apr 26, 2024 at 01:05 PM.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,091
Likes: 7,611
From: Poolville
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