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In my experience, 14.5 v is normal when charging.
Regards, Tony Drews
On 5/19/2025 4:52 PM, Chuck Gee via Fot wrote:
> I have a silly question, what voltage do you consider overcharging?
> Â My current one charges at over 14v (maybe 14.5v) and wondered if I
> should be worried. Â Iâ??ve done total loss for years and have just
> started using an alternator again.
>
> Chuck
>
>> On May 19, 2025, at 11:29â?¯AM, Tony Sheach via Fot
>> <fot@autox.team.net> wrote:
>>
>>  Hi all
>>
>> My experience is that if you are going to use one of these Nippon
>> Denso derived alternators, you need to go for the OE part.
>>
>> The various copies all have short lives, mainly because the diode set
>> lacks up and usually starts overcharging the battery and causing the
>> output voltage to vary considerably, usually upwards. Iâ??ve had this
>> happen and itâ??s not pleasant when a dry cell battery gets fat enough
>> to pop.
>>
>> You can buy diode sets for the original Denso units and these are a
>> quick change â??in the fieldâ?? so my view is to buy a decent one and a
>> couple of spare diode packs (the assembly with the spade terminals on
>> the end) and replace as necessary.
>>
>> I have one 80amp unit thatâ??s done 10 years and is going back in after
>> the current refit. I appreciate that most donâ??t need this sort of
>> output, but itâ??s usually wet and dark here so itâ??s everything on. The
>> smaller 45/50 amp units are probably longer lived.
>>
>> Best wishes to all
>>
>> Tony
>>
>>
>>
>> Sent from my iPhone
>>
>> On 19 May 2025, at 16:12, Michael Moore via Fot <fot@autox.team.net>
>> wrote:
>>
>> 
>>
>> Do you have the part number for the powermaster?
>>
>> Have a Good Day
>>
>> Mike
>>
>> Michael T. Moore, CPA
>>
>> 3255 West 26^th Street
>>
>> Erie, PA 16506
>>
>> Phone: 814-616-8652Â ext 100
>>
>> Fax: 888-865-5279
>>
>>
>> This electronic mail message contains confidential and legally
>> privileged information intended only for the use of the recipient. If
>> the reader of this message is not the intended recipient, the reader
>> is hereby notified that any dissemination, distribution, copying or
>> other use of this message is strictly prohibited and is hereby
>> instructed to notify the sender immediately by return email and
>> destroy this copy of this message.
>>
>> *From:*Fot <fot-bounces@autox.team.net> *On Behalf Of *JS Performance
>> Motoring, LLC via Fot
>> *Sent:* Monday, May 19, 2025 10:21 AM
>> *To:* Mike Harmuth <ofracer@gmail.com>
>> *Cc:* FoTTriumph <fot@autox.team.net>
>> *Subject:* Re: [Fot] What alternators are you using on a Spitfire?
>>
>> Mike,
>>
>>     The mini-denso style alternators work great. There is a
>> difference in quality between the cheapest, bottom of the barrel
>> options, and the more expensive options.
>>
>> When my $10 Amazon special failed at VIR last year (had been in
>> service since 2020), the backup unit I borrowed from Henry Frye
>> looked identical, but weighed substantially more! There's clearly a
>> difference.
>>
>> Currently, I'm running a powermaster brand and it seems to be well made.
>>
>> I also like to run a larger pulley to slow things down. Here in the
>> states, you can get a 4" pulley sold as Powermaster p/n 182. This is
>> a direct swap onto the mini denso.
>>
>> <image001.jpg>
>> <image002.jpg>
>>
>> We were also watching the J500 at my house, did you catch the medium
>> bore race, where under full course caution, the commentator shouted
>> "Slow down, Henry!". We about fell out of our chairs laughing!
>>
>> Jason Sukey
>>
>> JS Performance Motoring, LLC
>>
>> 440.984.7720
>>
>> jason@jsperformancemotoring.com
>>
>> www.jspmparts.com <http://www.jspmparts.com/>
>>
>> https://www.facebook.com/JSPerformanceMotoring/
>>
>> On Mon, May 19, 2025 at 9:01â?¯AM Mike Harmuth via Fot
>> <fot@autox.team.net> wrote:
>>
>> I'm getting tired of replacing the stock type alternators. They
>> used to last a few seasons but now it seems like a few weekends
>> is the norm.
>>
>> Â Like oil, I know there will be many different opinions,
>> including running without one. That being said, any
>> suggestions/part numbers/suppliers of a system that works for you?
>>
>> BTW, I enjoyed watching the Jeff 500 last weekend on the VRG live
>> stream (currently available on YouTube). Nice job against the 911
>> Mr. Frye.
>>
>> thanks
>>
>> mike h
>>
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://autox.team.net/archive
>> http://www.team.net/pipermail/fot
>> Unsubscribe/Manage
>> <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
>> http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com
>>
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/fot/tony.sheach@live.co.uk
>>
>>
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/fot/chasgee22@gmail.com
>>
>>
>> <image001.jpg>
>> <image002.jpg>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate:http://www.team.net/donate.html
> Archive:http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:http://autox.team.net/mailman/options/fot/tony@tonydrews.com
>
>
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<p>In my experience, 14.5 v is normal when charging.</p>
<p>Regards, Tony Drews<br>
</p>
<div class="moz-cite-prefix">On 5/19/2025 4:52 PM, Chuck Gee via Fot
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5BB0197B-708C-4247-BE96-D56DB922F4D1@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
I have a silly question, what voltage do you consider
overcharging? Â My current one charges at over 14v (maybe 14.5v)
and wondered if I should be worried. Â Iâ??ve done total loss for
years and have just started using an alternator again.
<div><br id="lineBreakAtBeginningOfSignature">
<div dir="ltr">Chuck</div>
<div dir="ltr"><br>
<blockquote type="cite">On May 19, 2025, at 11:29â?¯AM, Tony
Sheach via Fot <a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
Hi all
<div><br>
</div>
<div>My experience is that if you are going to use one of
these Nippon Denso derived alternators, you need to go for
the OE part.</div>
<div><br>
</div>
<div>The various copies all have short lives, mainly because
the diode set lacks up and usually starts overcharging the
battery and causing the output voltage to vary
considerably, usually upwards. Iâ??ve had this happen and
itâ??s not pleasant when a dry cell battery gets fat enough
to pop.</div>
<div><br>
</div>
<div>You can buy diode sets for the original Denso units and
these are a quick change â??in the fieldâ?? so my view is to
buy a decent one and a couple of spare diode packs (the
assembly with the spade terminals on the end) and replace
as necessary.</div>
<div><br>
</div>
<div>I have one 80amp unit thatâ??s done 10 years and is going
back in after the current refit. I appreciate that most
donâ??t need this sort of output, but itâ??s usually wet and
dark here so itâ??s everything on. The smaller 45/50 amp
units are probably longer lived.</div>
<div><br>
</div>
<div>Best wishes to all</div>
<div><br>
</div>
<div>Tony </div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div dir="ltr">Sent from my iPhone</div>
<div dir="ltr"><br>
On 19 May 2025, at 16:12, Michael Moore via Fot
<a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a> wrote:<br>
<br>
</div>
<div dir="ltr">
<meta name="Generator"
content="Microsoft Word 15 (filtered medium)">
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Do
you have the part number for the
powermaster?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"PPC Handwriting";color:#006600">Have a
Good Day</span><span
style="font-size:11.0pt;font-family:"PPC
Handwriting";color:#006600"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"PPC
Handwriting";color:#006600">Mike<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:#006600"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span style="color:#006600">Michael
T. Moore, CPA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006600">3255
West 26<sup>th</sup> Street</span><span
style="font-size:11.0pt;color:#006600"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006600">Erie,
PA 16506<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#006600"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span style="color:#006600">Phone:Â
814-616-8652Â ext 100<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#006600">Fax:Â Â Â Â Â Â Â
888-865-5279<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006600">Email:Â Â Â
<a href="mailto:mmoore@mtmcpafirm.com";
moz-do-not-send="true">
<span
style="color:#0563C1">mmoore@mtmcpafirm.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#006600"><o:p>Â </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.0pt;font-family:"Times New
Roman",serif;color:black">This
electronic mail message contains confidential and
legally privileged information intended only for
the use of the recipient. If the reader of this
message is not the intended recipient, the reader
is hereby notified that any dissemination,
distribution, copying or other use of this message
is strictly prohibited and is hereby instructed to
notify the sender immediately by return email and
destroy this copy of this message.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006600"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt"><o:p>Â </o:p></span></p>
<div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Fot
<a class="moz-txt-link-rfc2396E"
href="mailto:fot-bounces@autox.team.net";><fot-bounces@autox.team.net></a>
<b>On Behalf Of </b>JS Performance Motoring,
LLC via Fot<br>
<b>Sent:</b> Monday, May 19, 2025 10:21 AM<br>
<b>To:</b> Mike Harmuth
<a class="moz-txt-link-rfc2396E"
href="mailto:ofracer@gmail.com";><ofracer@gmail.com></a><br>
<b>Cc:</b> FoTTriumph <a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a><br>
<b>Subject:</b> Re: [Fot] What alternators are
you using on a Spitfire?<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<div>
<p class="MsoNormal">Mike,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Â Â Â Â The mini-denso style
alternators work great. There is a difference
in quality between the cheapest, bottom of the
barrel options, and the more expensive
options.  <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">When my $10 Amazon special
failed at VIR last year (had been in service
since 2020), the backup unit I borrowed from
Henry Frye looked identical, but weighed
substantially more! There's clearly a
difference.  <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">Currently, I'm running a
powermaster brand and it seems to be well
made.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">I also like to run a larger
pulley to slow things down. Here in the states,
you can get a 4" pulley sold as Powermaster p/n
182. This is a direct swap onto the mini
denso.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<div><image001.jpg></div>
<o:p></o:p>
</div>
<div><image002.jpg></div>
<o:p></o:p>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">We were also watching the
J500 at my house, did you catch the medium bore
race, where under full course caution, the
commentator shouted "Slow down, Henry!". We
about fell out of our chairs laughing!<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">Jason
Sukey<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">JS
Performance Motoring,
LLC<o:p></o:p></p>
</div>
<div>
<p
class="MsoNormal">440.984.7720<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a
href="mailto:jason@jsperformancemotoring.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">jason@jsperformancemotoring.com</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a
href="http://www.jspmparts.com/"; originalsrc="http://www.jspmparts.com/";
target="_blank"
moz-do-not-send="true">www.jspmparts.com</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a
href="https://www.facebook.com/JSPerformanceMotoring/";
originalsrc="https://www.facebook.com/JSPerformanceMotoring/";
target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">https://www.facebook.com/JSPerformanceMotoring/</a><o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<div>
<p class="MsoNormal">On Mon, May 19, 2025 at 9:01<span
style="font-family:"Arial",sans-serif">â?¯</span>AM Mike Harmuth
via Fot <<a href="mailto:fot@autox.team.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">fot@autox.team.net</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">I'm getting tired of
replacing the stock type alternators. They
used to last a few seasons but now it seems
like a few weekends is the norm.<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<p class="MsoNormal">Â Like oil, I know there
will be many different opinions, including
running without one. That being said, any
suggestions/part numbers/suppliers of a
system that works for you?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">BTW, I enjoyed watching
the Jeff 500 last weekend on the VRG live
stream (currently available on YouTube).
Nice job against the 911 Mr. Frye.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<div>
<p class="MsoNormal">thanks<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">mike h<o:p></o:p></p>
</div>
</div>
</div>
<p class="MsoNormal"
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