The B&C alternators are based on real Nippon Denso alternators. Depending
on the model and the age of the alternator, you may be able to remove the b
rush pack externally. The older model alternators brush pack is retained wi
th 2 screws at the rear of the alternator. Take the screws out and you can
withdraw the brush pack.
Once the brushes wear to the point that less than 1/2 of the remaining bru
sh is held inside the brush holder, they can "cock" and bind up. Same thing
that can happen on your car, truck, motorcycle or aircraft's brake caliper
s. Once more than 50% of the piston comes out of the caliper, it will "cock
" and bind up. This is the reason that there is a minimum thickness for bot
h brake rotors and brake pads.... to prevent that from happening.
Ralph, send me a photo of the rear of your B&C. I can then highlight where
the mounting screws are, assuming it's the correct style of alternator.
Other alternator style require you to split the 2 case haves of the alterna
tor to inspect the brushes. Once the alternator is removed, that is a fairl
y easy job.
Charlie Kuss [rhymes with puss]
PS I've CC'd this email to you personally, in case you don't have my email
address.
On Friday, May 2, 2025 at 07:57:22 AM EDT, <recapen@earthlink.net> wro
te:
Thanks Joe,
I have a spot where I can check the voltage directly at the battery - I wil
l
set that up for the next test flight!
The belt is the next easiest to check...
I can reseat all of the connections...
Anyone know how to check for worn brushes?
Thanks again,
Ralph
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
<owner-aeroelectric-list-server@matronics.com> On Behalf Of user9253
Sent: Thursday, May 1, 2025 22:26
To: aeroelectric-list@matronics.com
Subject: Re: B&C 60Amp alternator failure modes
The vast majority of electrical problems are due to bad connections, for
instance loose or corroded terminals.
Another possibility is an indication problem with the voltmeter.
Connect a separate voltmeter to the main bus to verify that the voltage is
actually dropping.
Other possibilities are worn alternator brushes or a loose belt.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515375#515375
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=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
