I'm at the track doing testing today(race Sat/Sun) so i can keep 3rd place for the season.

The car has a new painless harness in it with the stock Alt, it only has the big Pos+ hooked up. I think thi.s is why its not charging. Any help you guys can give would be hugh!

Thanks

I don't know about the LTx cars, but on the LS1 there is a big positive wire and a little enable wire. The alternator apparently does not have any internal or external voltage regulator per se. Instead, the PCM monitors the voltage (presumably using one of its many analog-to-digital conversion channels), and enables/disables the alternator as needed to maintain the proper voltage. I would expect the enable wire to be pulse-width modulated, but I haven't probed it with a scope to verify.

If the LTx alternators work the same way, you may have to swap in a "single wire" alternator. Grounding the enable would probably cause the voltage to go too high (possibly much too high when above idle).

Anybody have Mitch or Glens #? I know that they install this harness with a stock Alt.

I'm trying to Google it with no luck so far.....

From the wiring diagram at AllDataDIY and I relied on such to demod the harness in my 94.

The stock cluster put 470 ohms between +12V and the alternator terminal "L." Should be through the secondary normally closed terminals on the master disconnect.

We run a heavy gauge hot wire, separate from the Painless harness, from alternator to a pass through lug on the firewall.

That pass through lug piggy backs a couple things, like the starter and 12V for a couple relays to run fans.

On the other side of the firwall, I have fuse panels and the battery cable attached. So this is the charge path from the alternator to the battery.

I think the lug in the Painless harness is for the motor electronics.

Thanks guys, I got it fixed thanks to FRRAX, Google, and Alan Blain.