about 2 yr old "new" AC Delco Alt died - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 06-05-2016, 10:32 AM Thread Starter
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about 2 yr old "new" AC Delco Alt died

headed to a Sunday cruise....battery light on. did DVM test....11.6 VDC checking battery terminals with engine running. Was all good when I pulled the car in garage last night..just start up this am I see battery light on

So it would appear the Alt is not outputting enough VDC. Alt swap is no big deal but for the $149-$179 depending on what reman from what chain store I am going to take a step back.

The "new" AC Delco I got was from Rockauto so no warranty anymore but the $ was good and for the $115 for a "new" one I may go that route again. These "new" AC Delcos are made in Mexico now.

Just disappointing the "new" one I bought had a short life

All connections are good, Gary's cables, belt, tensioner, solid battery,etc are good. Shiat happens

IDK if voltage regulator or a diode craped on the bridge. All the old school rebuild shops have long gone away anywhere near me...even far from me.

I will go see if my original is still in attic. It had a slight bearing squeak so I can swap parts over to make one good one likely

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post #2 of 14 (permalink) Old 06-05-2016, 10:59 AM
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I'd crack it open, and rebuild it, or grab an OE from the junkyard.
They are very easy to rebuild, and even good parts are cheap.
I'd also rebuild the other one you have, and then you have a spare, for a fraction of the cost of a "new" one.

With the lack of quality/longevity of even "new" parts these days, used seems to be a better choice IMHO.

Last CS144 I picked up from local yard cost me $17, and been on my Jeep for ~6yrs w/o any issues.
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post #3 of 14 (permalink) Old 06-05-2016, 12:36 PM Thread Starter
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yeah "new" is not what it used to be...

pulled my original 144 from attic, put new brushes in it and it works fine. $1.67. It had that very slight "chirp" to it when I spun it by hand but is quiet on the car. Ironically the one I pulled off also had a slight chirp to it spinning by hand but was quiet on car

Will poke around the "new" one and see if I find a diode out. I see rockauto has the rectifier bridge for ...ouch $104. Not worth it as a new alt is $114

searching for rebuild kits I find several but apparently part #s specific even if for a CS 144. Can't find one to match my part #.

My part #'s are:

ACD: 335-1048 (and alternator has 12333 after that)

GM#: 88877258

I don't have a bearing press to get the old bearings out and am hesitant to just "pounding" out old and installing new that way

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post #4 of 14 (permalink) Old 06-05-2016, 01:02 PM
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Whenever I have needed alternator parts I avoid parts stores or even rockauto/online outfits. I quit buying new/rebuilt alternators because they just never last it seems. I've had much better luck with JY units sadly.

I use alternatorparts.com they have never let me down with parts.
They have always answered my questions quickly, when I was unsure what part to order if it'll work, etc., etc.

CS144 Series Alternator Parts Bridge Rectifier

I don't have a press either, I usually just bring anything to a shop for anything that requires a press.
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post #5 of 14 (permalink) Old 06-05-2016, 01:36 PM Thread Starter
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IDK if it is the bridge rectifier or the voltage regulator that went bad

I watched the youtube vid on how to rebuild. The bearing swap can be done with hand tools....involving heating case in oven and or freezing bearing to get them in. You do need to chisel or use BFH to push the rear bearing out as the case casting lip is rolled over the edge of the bearing apparently. You then stake around the new bearing

So my 110k 18 year old original alt is back in the car with new brushes. The only reason I replaced it was it had a bearing chirp on start up but went away very quickly so who knows it may last another 20 years

I will call the parts place you noted and get the rebuild kit for my 2 year old one and have it as a spare when my original finally craps itself

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post #6 of 14 (permalink) Old 06-05-2016, 06:46 PM Thread Starter
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so preliminary check the diodes in bridge rectifier seem to check out per method in this video

https://www.youtube.com/watch?v=xgikeXt91vM

mine was 1 with + on the power terminal and - on case and reversing that I get 573 so according to this test method the diodes are good in the rectifier.....which typically is what fails

auto part store alt test just says it failed, no specific reason why.

soooo given the diodes in rectifier seem to be good and I can't find a test procedure for the voltage regulator...I suspect it is the regulator. Fortunately those are around $15 for the "HD" version from a few Alternator Part web places

If anyone could shed any light on how to test the voltage regulator or comment on the procedure in video to test diodes, appreciated

this alt has around 6k miles on it

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Last edited by BALLSS; 06-05-2016 at 06:55 PM.
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post #7 of 14 (permalink) Old 06-05-2016, 08:45 PM
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These guys are da bomb and have never failed me:

Roadmaster Alternator

Free shipping, great prices, new, lifetime warranty.

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post #8 of 14 (permalink) Old 06-06-2016, 10:27 AM Thread Starter
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the link posted say they are "new"..."aftermarket" alts. But to contact them for "OE" ones.

thanks anyway but I am just looking to fix the one I have or otherwise I would just buy a "new" AC Delco again for $114 from Rock Auto.

I have not opened it up yet but have before on my original to replace brushes so replacing internal parts is something I can do.

I was just looking for a test procedure for the voltage regulator if someone knows.

It took all afternoon to bring the battery back to full voltage with my trickle charger. Battery is 2 year old Diehard AGM.

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post #9 of 14 (permalink) Old 06-06-2016, 03:29 PM Thread Starter
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On further review...

....it would appear the brush wire broke.

$2.99 fix assuming this is the only problem

also using the DVM on the rectifier to test diodes I get same readings as the youtube vid

will pick up a brush set 2moro and see if this resolves the issue...
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post #10 of 14 (permalink) Old 06-06-2016, 04:34 PM
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Quote:
Originally Posted by BALLSS View Post
....it would appear the brush wire broke.

$2.99 fix assuming this is the only problem

also using the DVM on the rectifier to test diodes I get same readings as the youtube vid

will pick up a brush set 2moro and see if this resolves the issue...
Nice, hopefully that's all it was/is, and for a few bucks you're good.
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