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post #1 of 13 Old 07-31-2017, 09:13 AM Thread Starter
NAJ
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ND Alternator Brush Holder Replacement

I will make this a sticky once people know it is here.
I had this problem 10- 12 years ago and again this past week.

Problem;
CEL Illuminated With A Code 41 (Alternator Field Circuit Not Switching Properly)

Cause: (SEE PICTURE #1)
Worn Brushes Not Making Proper Contact With The Commutator
A New Brush Holder Can Be Purchased for Under $10.00 on eBay.
I Stock One.


Tools Needed:
1)1/4" Drive Ratchet
2)7 mm, 8 mm, 10 mm, 12 mm - 1/4" Drive Deep Sockets
3)#2 Stubby Phillips Screwdriver
4)Compressed Air (Can For Computers Will Work Fine)
5)CRC QD Electrical Contact Cleaner or 91% Rubbing Alcohol
6)Toothpick

Time Required;
1/2 - 3/4 Hour W/Alternator On Car

1)Disconnect and Isolate the - Battery Terminal.
2)PICTURE 2
Remove the wiring from the rear of the alternator.
After all of the wiring is removed then remove the remaining 12 mm nut from inside the plastic battery cable guide on the rear of the alternator and remove the guide.

3)PICTURE 3
Remove the three nuts holding the tin cover to the rear of the alternator and remove tin cover.

4)PICTURE 4
Remove the three Phillips screws holding the brush holder to the alternator and remove the brush holder.

5)Use the compressed air to blow out all of the dust in the alternator from the old, worn brushes.
6)Use the electrical contact cleaner or alcohol to clean the commutator and electrical components in the rear of the alternator.
7)When installing the new brush holder use the toothpick to depress the brushes in the holder while sliding it over the commutator.
8)Re-install all of the other components in the reverse order they were removed.

1
ND Alternator Brush Holder Replacement-_20170730_082756.jpg

2
ND Alternator Brush Holder Replacement-_20170729_132926.jpg

3
ND Alternator Brush Holder Replacement-_20170729_130913.jpg

4
ND Alternator Brush Holder Replacement-_20170729_130030.jpg

Jan
1990 Daytona Shelby VNT

40 Years ASE Certified (Retired)

Last edited by turismolover22; 09-03-2019 at 09:21 PM. Reason: Added images in-line for ease of viewing
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post #2 of 13 Old 07-31-2017, 09:55 AM
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Re: ND Alternator Brush Holder Replacement

Just to add a little more value to this post, we also have a 'How-To' for a complete Nippondenso alternator rebuild located in our electrical FAQ forum:

https://www.turbododge.com/forums/f4/...lternator.html
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post #3 of 13 Old 07-31-2017, 11:31 AM Thread Starter
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Re: ND Alternator Brush Holder Replacement

Quote:
Originally Posted by ILIKESHELBYS View Post
Just to add a little more value to this post, we also have a 'How-To' for a complete Nippondenso alternator rebuild located in our electrical FAQ forum:

https://www.turbododge.com/forums/f4/...lternator.html
Did not know that thread was even there.
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post #4 of 13 Old 07-31-2017, 03:08 PM
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Red face Re: ND Alternator Brush Holder Replacement

Quote:
Originally Posted by NAJ View Post
Did not know that thread was even there.
....but it doesn't cover in any detail how to do just brushes. Good job NAJ, a high value post on brush replacement in it's own regard and thanks from all.
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post #5 of 13 Old 02-06-2018, 09:51 AM
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Re: ND Alternator Brush Holder Replacement

What is the part number for the correct brushes? I looked google it up and find many different types. Thx-Ace
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post #6 of 13 Old 02-06-2018, 07:57 PM Thread Starter
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Re: ND Alternator Brush Holder Replacement

https://www.ebay.com/itm/Denso-ALTER...9X1wpJ&vxp=mtr
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post #7 of 13 Old 02-07-2018, 09:48 PM
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Re: ND Alternator Brush Holder Replacement

Thank you. Ace
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post #8 of 13 Old 06-22-2018, 10:04 AM
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Re: ND Alternator Brush Holder Replacement

Perhaps add, other than appearance, how to identify a Denso alt? Is this a denso alt, what are the other indications that it will fit before I order the brush?
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post #9 of 13 Old 06-25-2018, 07:15 AM Thread Starter
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Re: ND Alternator Brush Holder Replacement

The ND brush holder is the same for all Chrysler ND alternators.
Just look at the pic of the brush holder and compare to pic on eBay.

This is all I have to identify a Bosch/ND alternator.

ND Alternator Brush Holder Replacement-img_new.jpg

ND Alternator Brush Holder Replacement-img_0001_new.jpg
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post #10 of 13 Old 08-30-2019, 10:54 AM
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Re: ND Alternator Brush Holder Replacement

I’m glad you brought this up.
I’ve been doing this on L-bodies also.
It’s such a cheap fix whether it’s the ND or the original Chrysler 78 amp.
I have a couple of (Chrysler 78 amp) sets in my parts box also.

Last edited by Jim Falco; 08-30-2019 at 10:57 AM. Reason: Additional info
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post #11 of 13 Old 09-04-2019, 10:24 AM Thread Starter
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Re: ND Alternator Brush Holder Replacement

Quote:
Originally Posted by Jim Falco View Post
Iím glad you brought this up.
Iíve been doing this on L-bodies also.
Itís such a cheap fix whether itís the ND or the original Chrysler 78 amp.
I have a couple of (Chrysler 78 amp) sets in my parts box also.
I did not know the brushes were easily replaceable on the Chrysler Alternator, same procedure?
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post #12 of 13 Old 09-29-2019, 01:20 PM
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Re: ND Alternator Brush Holder Replacement

Quote:
Originally Posted by NAJ View Post
I did not know the brushes were easily replaceable on the Chrysler Alternator, same procedure?
I believe so.
I remember the brushes being on springs and square end pieces that helped guide the brushes in.
They were screwed in to place.
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post #13 of 13 Old 09-29-2019, 02:03 PM
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Re: ND Alternator Brush Holder Replacement

Iíll find more info ASAP but what I do remember it being the standard Chrysler 78 amp alt.
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