First, I should mention this is a LS1 swap. I completed the swap back in April 2009. I did all the wiring, everything was soldered. The car runs fine, although a tune is in order.

Problem:

Battery is dead after 2 days of no start. I narrowed the draw to my ECM constant 12v+ at the fuse box.



As a temporary fix, I've wired the Constant into Ignition Accessory.

Problem with that, the computer is relearning every time you start it.



I've been driving the car daily since April (when I completed the swap)

I've killed 4 batteries. Although, the first couple dead batteries were a combo of the PCM constant and a defective replacement Headlight actuator. The battery would be dead overnight. I've since fixed the actuator.



So basically, the draw is not severe, but its significant.



I really need help on this one. Ideas?



Setup:

'85 Trans Am

'00 TA LS1 (assuming the PCM is the same)

Battery Relocated to trunk

LS1 fuse box located in trunk

PCM located under dash on Pass. Side

 

Oh man! I am kicking myself!



Problem fixed!!!! After posting this thread last night, I decided to go over my wiring notes and references.



I reversed the IGN postive(Pink) for PCM & Battery positive (orange) for PCM.
So the constant was wired as ACC, and the ACC was wired as Constant.


So for 7 months, I've never had the correct PCM constant wired. There is no drain on the battery anymore.



Maybe this will help someone else who runs into something similar.

 

Having the same issues, I'll double check this on mine tomorrow!