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Date: Fri, 19 Oct 2012 08:28:57 -0400
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: TCM 60A alternator--diodes
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I wouldn't feel quite that confident in the replacement diodes. =A0The stat=
or current flows in series through 2 diodes at any given time and the curre=
nt cycles between the diodes as the alternator rotates. =A0So for a portion=
 of the time a given diode will be passing 100% of the current - but not al=
l the time since they "take turns." =A0I don't know how the diode package w=
as rated, but I think the 50-amp rating is marginal for a 60-amp alternator=
. =A0Given that, the alternator will rarely, if ever, be asked to deliver a=
 full 60 amps, and there is certainly some margin built into the diode rati=
ng. =A0And the rating is a function of operating temperature, so if the alt=
ernator stays cool, it's better. =A0If you could find a diode assembly rate=
d at 60 amps or more it would be a good thing. =A0The 50 amp assembly will =
probably work okay, though. =A0It's just not 50A X 6 =3D 300A. =A0And if yo=
u routinely fly IFR at night with everything turned on and lit up....well,
 that's up to you.=0AGary Casey=0A=0AThe diode assembly was sourced at my l=
ocal shop with a spare set of brushes for $20 total.=A0 These are 50A diode=
s (50A x 6 diodes) which is a robust replacement satisfactory for even the =
100A alternator.=A0 I had to remove the B+ stud from the old diode assembly=
 and press it into replacement diode package.=A0 The re-assembly took about=
 20 minutes and it fired up with 10A charge on low engine idle.=A0 This is =
much higher charge at low idle than I can ever recall.=0A=0APaul=0A
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div><div>I wouldn'=
t feel quite that confident in the replacement diodes. &nbsp;The stator cur=
rent flows in series through 2 diodes at any given time and the current cyc=
les between the diodes as the alternator rotates. &nbsp;So for a portion of=
 the time a given diode will be passing 100% of the current - but not all t=
he time since they "take turns." &nbsp;I don't know how the diode package w=
as rated, but I think the 50-amp rating is marginal for a 60-amp alternator=
. &nbsp;Given that, the alternator will rarely, if ever, be asked to delive=
r a full 60 amps, and there is certainly some margin built into the diode r=
ating. &nbsp;And the rating is a function of operating temperature, so if t=
he alternator stays cool, it's better. &nbsp;If you could find a diode asse=
mbly rated at 60 amps or more it would be a good thing. &nbsp;The 50
 amp assembly will probably work okay, though. &nbsp;It's just not 50A X 6 =
=3D 300A. &nbsp;And if you routinely fly IFR at night with everything turne=
d on and lit up....well, that's up to you.</div><div>Gary Casey</div>  <spa=
n><span class=3D"Apple-style-span" style=3D"color: rgb(69, 69, 69); font-fa=
mily: arial, helvetica, sans-serif; font-size: 13px; "><br><br>The diode as=
sembly was sourced at my local shop with a spare set of brushes for $20 tot=
al.&nbsp; These are 50A diodes (50A x 6 diodes) which is a robust replaceme=
nt satisfactory for even the 100A alternator.&nbsp; I had to remove the B+ =
stud from the old diode assembly and press it into replacement diode packag=
e.&nbsp; The re-assembly took about 20 minutes and it fired up with 10A cha=
rge on low engine idle.&nbsp; This is much higher charge at low idle than I=
 can ever recall.</span></span></div><div style=3D"color: rgb(69, 69, 69); =
font-size: 13px; font-family: arial, helvetica, sans-serif;
 background-color: transparent; font-style: normal; "><span><span class=3D"=
Apple-style-span" style=3D"color: rgb(69, 69, 69); font-family: arial, helv=
etica, sans-serif; font-size: 13px; ">Paul<br></span></span></div></div></b=
ody></html>
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