Quoted from ryanbrooks:I believe Coyote and Going4 are right. What you’ve described is either ribbon cables or a prior owner/would be tech replaced some connectors and didn’t key them and things aren’t plugged in wrong. It’s embarrassing. We’ve all done it. I’ve worked on this stuff my whole life and I still make simple errors like this at times.
I hate to say it, but it literally just happened to me a week ago. On my TZ, even. I plugged them all in - double-checked everything and... STILL had an issue. Peer more closely - this time, I somehow reversed one end of a cable. *facepalm*
The flashers that are stuck on in BlackEuropa 's case are all controlled by the 8-driver board - the small, additional board in the backbox. It also reports the 9th switch column (the clock). If it's not plugged in properly, the transistors are powered, turning on all the flashers. It's possible that the ribbon cable is correct, but the 8-driver board's not getting power, or wrong power.
In either case, I'm follow - I'm curious to see what it does turn out to be.