Has anyone been able to technically determine why a GM OEM c6 145A alternator won't work, or can't be tuned to work with a c5?
Beyond some seemingly boogey man talk about PCM incompatability , there doesn't seem to be a technical or reliable explanation when dealing with OEM or NEW GM parts.
(that is to say, some of the issues seem to be related to sub-par aftermarket or rebuilt parts)

let's get even more specific:
I have a '98 M6 equipped with a factory Valeo 110A alternator....and have a c6Z clutched 145A NEW GM OEM 15841234 alternator accessible

What technical reason exists for them (them = my car and this c6Z alternator) to not get along?

And, to complicate things further, are there "settings" in the newer PCMs that can not be adopted to the (my '98) older PCM to get them to play together?

You could say I'm looking for technical explanations that suggest the problems are insurmoutnable (vs variable but addressable issues like bad grounds, weak batteries, loose belts, poor connections, corrosion, etc. that are known as general trouble makers in c5/c6 electrical systems)

Open to thoughs on this. If I have to be the guinea pig on this, I guess I will... but I'm sure someone has gone thru this and thought about it

 

everything you ever wanted to know at this link

https://www.corvetteforum.com/forums...nd-issues.html

 

I've read that (and dozens of other posts on 145A alternators) and unless you can point out something I missed, it does not address what I'm asking.

 

Half the problem is that there is a forum member who claimed insider information and then posted lots of voodoo BS about how the alternator and PCM were matched until everyone believed it was impossible to use any other alternator. I know you can turn the codes off and/or disable the PCM F/L terminals in the OS and then use any alternator you want. A number of forum members have successfully done this. Unfortunately, they rarely post about it because the fore mentioned forum member would have a hissy fit and post a bunch more BS about how it was impossible and call them names for even suggesting it.

The 2008 C6 alternator connects to the PCM the same way a C5 alternator connects. The 2008 C6 code descriptions match the 2001-2004 C5. I'd give that alternator a good chance of working in a later model C5. I'm not sure about the early model C5 though. I'm also not sure about physical fitment. If the regulator can interchange, then put the early C5 regulator into the C6 alternator and you'll make a compatible 145A alternator for your C5.

If it doesn't work, then the only way to determine why is to put a scope on both and measure the off, starting and running signals and try to determine when C6 deviate from the C5 signals enough to cause the issue. There won't be much that can be done about it though because the internal PCM programming is what causes the codes and that can't be changed without hacking it. Programs like HPTuners are only setup to turn the codes on and off, not adjust the set points that determine the code has occurred.

 

MMM ???....maybe I’ll put my scope on the alternator terminals that are applicable to this and see what I have on my ‘01 !!

 

Great information Thanks very much