[firehawkclone]

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

[sgarnett]

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).

This post has been edited by sgarnett: Nov 7 2008, 06:36 PM