Ok, after unplugging the boxes to test the voltage, I must have either jarred something back in place, or cleaned a contact; because the 4 matic is working again. I took some hard turns over the weekend, and the light came on twice. That was good, because I found out that it's a really expensive box. The fuel injection is still messed up, so I'll have to keep troubleshooting that one or looking for a cheap used one.

Dave