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Hi Guys so I see alot of post on here guys having problems with their replacement alternator. and thought to share what I found out.
if someone thinks I am incorrect please let me know so we can edit it asap.
my car is a 99 C5 6 spd
I have a bearing noise from alternator but charges just fine.
so I like to replace unit and be done with her.
after I contacted my jobber and ac.delco.I asked which part number to order in they both told me
ac delco 334-1280 or 19134273
so I went ahead and ordered this up.
fits fine but I get the warning in the dash about faulty charging etc.
plus voltage gauge is down unless I rev engine up.
so clearly this unit was not good.
few things to note. the ac delco part number listed above is for the professional line of products which is (made in china)
now after looking at my own OEM Valeo (made in france) unit part number is
GM#10246634. this number has been replaced by GM with #10316182
so if you see other post on here some guys say first number is correct and others saying second number is correct you now know why.
so to continue. GM dealer says $600 bucks for OEM new Valeo or I can get a reman unit from ac delco for half that from GM dealer. I asked him for part number for the ac delco unit and sure enough he tells me 334-1280
this we know since I already have this unit with me does not work.
so long story short since I am not able to get info on a correct reman unit
I will be ordering 10316182 which is new Valeo but from my jobber which is a lot less then from dealer but still new OEM
hope this info helps and is correct alot of wrong information is out there on the forums and I hope to have cleared up some of it
The PCM doesn't talk to the alternator and it doesn't control the charging. The alternator sends an on-off and pwm signal to the PCM and lots of alternators are built with those same outputs.
The problem is that the PCM is fussy about the timing of the alternator turn-on which is why you see the message when you start your car.
You can go here and get a new bearing for your alternator. Pretty simple and cheap fix.
[QUOTE=1999C5JSS;1589490864]I would rather just save mine untouched just incase it needed.
Not sure I understand if you take your OEM alternator to a shop to rebuild it, it will still be your original OEM alternator. the reason I started doing it, was on some collector cars I wanted the numbers matching parts rebuilt and put back on the car..it's not an exchange like at some auto parts store, they rebuild/ repair YOUR OEM unit.
The PCM doesn't talk to the alternator and it doesn't control the charging. The alternator sends an on-off and pwm signal to the PCM and lots of alternators are built with those same outputs.
The problem is that the PCM is fussy about the timing of the alternator turn-on which is why you see the message when you start your car.
You can go here and get a new bearing for your alternator. Pretty simple and cheap fix.
It looks like a Valeo case but it's hard if it's correct from a few pictures. Are there any significant differences between that one and your original? It's the right number so you might as well try it.
110A vs 140A doesn't make any difference despite claims on this forum. The PWM signal that tells the PCM the field winding duty cycle still goes from 0% to 100% no matter how many amps the alternator can produce. There is no output current sensing or electrical load sensing in a C5 so the PCM can't know the alternator is producing more than it's rated 110A. All the PCM knows is that the alternator is working at 30% of maximum output or 85% of maximum output as examples.
Last edited by lionelhutz; May 1, 2015 at 06:25 PM.
It looks like a Valeo case but it's hard if it's correct from a few pictures. Are there any significant differences between that one and your original? It's the right number so you might as well try it.
110A vs 140A doesn't make any difference despite claims on this forum. The PWM signal that tells the PCM the field winding duty cycle still goes from 0% to 100% no matter how many amps the alternator can produce. There is no output current sensing or electrical load sensing in a C5 so the PCM can't know the alternator is producing more than it's rated 110A. All the PCM knows is that the alternator is working at 30% of maximum output or 85% of maximum output as examples.
Yes I know I can have rebuilt right now I am trying to understand what's what this new unit is correct part number and listed as oem with notes on computer as valeo but not sticker up like my original . Pulley is different being so it has clutch style but maybe this is what the replacements are nowadays
Maybe if I got from dealer this is what they would ship me too who knows
I think since they don't make anymore Valeo units this is the new part and its used on auto or m6 cars to make things more simple
Box it came in
Last edited by 1999C5JSS; May 1, 2015 at 09:14 PM.
Well I can tell you it is NOT OEM for your car since it has a decoupler as I have discussed before. That will have no effect on electrical performance.
Whether or not it will work and not throw messages I have no clue. Made in Poland is not a good sign.
Well I can tell you it is NOT OEM for your car since it has a decoupler as I have discussed before. That will have no effect on electrical performance.
Whether or not it will work and not throw messages I have no clue. Made in Poland is not a good sign.
I think this is now the replacement to oem new if anyone wants to order one. I was researching and there are no valeo units made anymore like when the part number was 10246634. as we know that number was replaced with 10316182.
I also found out that 10316182 part number came out back in 2004.
also if you look up 10316182 they are all sold with that style pulley now. so forsure looks like they did this to simplify things.
I think this is now the replacement to oem new if anyone wants to order one. I was researching and there are no valeo units made anymore like when the part number was 10246634. as we know that number was replaced with 10316182.
I also found out that 10316182 part number came out back in 2004.
also if you look up 10316182 they are all sold with that style pulley now. so forsure looks like they did this to simplify things.
ps installed last night and working fine.
Like I said many posts back. 010316182 came out by GM in 2001 with a decoupler for the automatics, Anything with that part number SHOULD have a decoupler. It should be 110 Amps.
Folks, looks like I have the same problem as the original poster. 2001 MN6 Coupe with 10246634 Alternator, was replaced with 19134272 AC Delco by my local mechanic, and shows the charge system fault . Before I take the plunge and get the original one remanufacturered as everyone suggests (I am going to have to eat the cost of the one just put in), is there not the potential to just purchase the (correct) Valeo regulator and put on the Delco alternator? I don't know where it is located, so not sure this is even a valid inquiry, but wanted to doublecheck before I go the reman route. Thanks for any guidance!
Currently going through altenator issues also. I have a Valeo 439217 ordered as my windings where toasted. I thought maybe I just had a bad regulator at fisrt before i opened it and started looking for them and found this site posted https://store.alternatorparts.com/m5...-corvette.aspx
Alternator information to share
