V1 No Crank when Headlights off

[RobC76]

Pulled front half of harness out of car and putting on table to work on it. It was a ground coming from the BCM that was tied to a ground coming from ECM instead of being grounded. This fixed all of the back feed / headlight issues but now it won’t crank lol. I will dig into the no crank tomorrow. When going to crank position on key the BCM crank relay engages but I did not have schematics / pinouts of the ECM / Fuse center stuff which I’ll get tomorrow. Really appreciate all of everyone’s help. Wiring can be quite challenging.
Thanks again

 

[Gtstorey]

Pulled front half of harness out of car and putting on table to work on it. It was a ground coming from the BCM that was tied to a ground coming from ECM instead of being grounded. This fixed all of the back feed / headlight issues but now it won’t crank lol. I will dig into the no crank tomorrow. When going to crank position on key the BCM crank relay engages but I did not have schematics / pinouts of the ECM / Fuse center stuff which I’ll get tomorrow. Really appreciate all of everyone’s help. Wiring can be quite challenging.
Thanks again

And some think a EV donor would be a good idea.

 

[RobC76]

Solved…
So the two needed grounds that were tied together instead of going to ground solved all of the issues. As I posted last night I had no crank function anymore. Chased and pinned out every plug in the harness. That only took 4 hours lol. Found that the clutch switch was bad. Ironically failing in the middle of it all. Swapped out brake switch and manually actuated it. Cranked as normal. If I would have been through this first making the harness would have been a bit easier!
Thanks for all the ideas and help!