[PAAirheads] Electrical Gremlins

[Tom Cutter]

Good thorough detective work, Larry!
--
Tom Cutter
Yardley, PA
www.RubberChickenRacingGarage.com



On Tue, Feb 5, 2019 at 11:54 AM Larry A. Mansfield via PAAirheads <
paairheads at casano.com> wrote:

> A couple of weeks back I had charging system issues on my R90S. Really
> confusing.  I'd replaced the stator, the rotor, the voltage regulator,
> and Diode board and thoroughly cleaned all connections.  The system was
> only putting out about 8.5 to 9v back to the battery.  Not good.
>
> Went through all the normal tests.  Rotor tested out fine. Stator tested
> out nicely.  All three leads from the stator and the Y lead were
> correct.  The voltage regulator test with a jumper showed low voltage to
> it.  Diode board also tested fine.  Totally confusing.  Then with the
> alternator assembly off I tested the continuity on the brushes.  Bingo
> on the brush assembly.  Both sides were grounding out to the stator
> cover, aka continuity.  D- should, DF or D+ shouldn't.  Looking the DF +
> side over I finally found the culprit.  The fiber washer on the inside
> had chunked and it was allowing the nut on the post to ground to the
> cover and the case.  Enough to affect the output voltage.  Removed the
> brush assembly and put new fiber washers on inside and outside. Charging
> system back to full output.
>
> Wanted to pass that along as an additional test to do if you experience
> electrical issues.  A test that isn't normally mentioned.  Usually the
> brushes are considered the issue.
>
> larry m
>
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