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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #141  
Old 5th December 2015
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Brushes must be on the wrong terminal. Or orientated incorrectly then.

Changing + and - reverse rotation. Good luck with it.
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  #142  
Old 2nd April 2016
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Quote:
Originally Posted by smokey 2 View Post
Mick, there is a ton of great info in here, thank you and all contributors.
One question for now. I am running the bench test on a generator I have on the shelf,
and it runs counter-clockwise, backwards from what the test says. What the heck
does this mean?
Had this issue a few months ago after a generator rebuild and for anyone else dealing with this, yes the wires are oriented wrong...inside. Pulled mine apart again and switched them. Squared the generator right away.

Ken
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  #143  
Old 3rd April 2016
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All 2 brush generators have the A lead connected to a field winding and a brush. "F" terminal only has a field wire
the other brush lead goes to ground.
http://www.ruiter.ca/mc/info/PDFs/1R-118.pdf
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  #144  
Old 5th April 2016
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Glad this got a bump...facing these issues myself with the recent purchase of a '78 XLH Anniversary Edition. Working through what seem the typical charging system issues and this guide is proving to be most useful.
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  #145  
Old 5th April 2016
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Please start a new thread and post up a pic of your '78 AE. There are a few of us on here with one of those.
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  #146  
Old 4 Weeks Ago
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does anyone know the field coil test? My Haynes manual has like no tests in it.

I am totally stumped on why my battery does not charge. It looks like I cooked an armature ( i took it off and brought it to an auto electric place and they said "this is burnt.")

I have tried: putting in a new wire and pole for A terminal; switching regulators; putting in a NOS HD armature; polarizing gen and nothing works.
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  #147  
Old 4 Weeks Ago
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A burned armature is usually caused by a runaway generator (unregulated output).
Usually caused by something shorting the F terminal to ground.
"Flashing" the F terminal will burn the regulator contacts together and cause this.
If you have a working generator light there is no need to polarize, the generator polarizes on every start.
Running the bike on a dead battery can smoke the armature.
Running high wattage Halogen lights can overload a generator.

Field coil failures are not common.
Check for continuity across the coil and short to ground.
If you are testing installed coils the A terminal brush must be lifted to open the path to ground through the armature.
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