C5forFun

Anyone with first hand knowledge on why the transmission is relevant to the alternator???
It doesn't make any sense to me. Aftermarket offers same one fits both, Valeo offers a 110amp and a 140amp (both as direct fit). Billet tech offers 170amp and 240amp ones that fit both?
*** senior forum members are warning that only exact replacement works! use extreme caution***

I have seen weird requirements from other manufacturer's (VW vin number matching requirements), but never on Chevrolet.

What is the real deal? Any one know for fact?

My 2008 manual 6spd alternator just quit charging...

93Polo

Corvettes can be a little weird on alternators (I remember LT1 C4 owners also reported some odd problems), I just had my factory one rebuilt by a trust local shop rather than chance an aftermarket replacement.


https://www.corvetteforum.com/forums...tem-fault.html is a good old topic listing changes.

lionelhutz

Automatics have a damper pulley on the front that dampens out belt harmonics caused by the low idle rpm. It has nothing to do with the electrical side and many people run automatics without the damper pulley without hurting anything, but some people will tell you it can break brackets and damage belt drive parts.

The Highlander

This is interesting:

the 02-04 also have Valeo diagnostics enabled.

Thanks

Sam Handwich

NOT helpful.............

sirdano

OR you could just buy this and fix it yourself
http://www.ebay.com/itm/290953992655...%3AMEBIDX%3AIT

You have to check there are two different ones depending on your alternator

Chicago1

So awhile back I had mine rebuilt and I kept getting charging system fault when I got it back. Looks like they put in a automatic regulator so yes it absolutely matters if it's auto and what year. Kudos to the place because the owner gave me his off his 04z cause he felt bad I had to come back 3x and I had the blower on the car so kinda sucked having to take off and put it on..he called me a few days and told me about having the automatic part in it and thus the error codes. He let me keep his and just threw my old one on his

GCG

Take a look at this post. It has info on the right regulators for both, 97-01 and 02-04. The price is around $30.

lionelhutz

There is no such thing as an automatic transmission regulator in the alternator....

racebum

but there are different amprage alternators between years, between transmission and this has been an ongoing issue with the c5 which is why people should have their stock one rebuilt, not buy something from the parts store

Pounder

before replacing Alt. read this !!!!
https://www.corvetteforum.com/forums...nd-issues.html

lionelhutz

There was never an amperage difference between transmissions or any electrical difference between the alternators on auto vs manual cars of the same year.

The simple fact that I stated was to attempt to put a stop to the WRONG information saying the regulator is dependent on the transmission type. Sadly, it's yet another piece of bogus info spread across this forum that people who don't know will have to figure out themselves.

Once again, the only model year difference between auto and manual transmission alternators is the decoupler pulley, which is a completely mechanical part with nothing electrical about it.

The sticky by Dadaroo (Sam RIP) is very good factual information.
The post by GCG with the regulator info is very good factual information.
Both are data you can rely on.

There are a number of "insider expert" posts that are constantly pointed to which are full of completely misleading information, mostly either a completely made up false explanation about how the alternator functions, completely bad information on how the PWM feedback circuit works or falsely claiming the car monitors the current draw of the various individual circuits.