What does a wiring harness with orange, purple, and black wires go to and where?

I looked through all the wiring schematics and found nothing. Could it have been disconnected prior to the work?

Me too! Joe didn't get nothing on that harness/connector, maybe for a future use-What exactly is your car doing? if its doing okay continue to march

I don't think it was disconnected when I started. I replaced my heater core and took the dash apart. It was running before but now it will only start for a minute and then die out. Is it possible for it to do that if one of the hoses to the core on the firewall is not on all the way or does not have enough pressure?

Check the blower motor resistor and blower motor wiring connectors make sure its firm/tight. Check every wiring connectors you can find-

Ok thanks.I guess I will just go back through all the wiring under the dash board that I reconnected.

Let us know if you find it. I wish we could be more help, but with the schematics, it is hard to find. Being there would make it a little easier, but still difficult.

Orange, purple and black (with a white stripe) are the colors of the wires going to the On-Board Diagnostics (OBD) connector in my 1994 Buick Century. It's a 12 slot connctor with only those 3 wires in it.

Do you know where it connects? Please tell me you do? It would save me so much time!

If we're talking about the OBD, it doesn't connect to anything under normal circumstances. It's used to connect a scan tool to read the engine trouble codes.

See the message thread on this web site labled "High Idle Speed"
That thread is discussing a different topic but it has a diagram and a picture of the OBD connector from a 1995 Buick Century. It looks the same as mine. It's mounted under the dash, under the steering column.

Ok thank you. At least now I know that's not the problem. Still trying to find the problem. It turns over and may start for a minute but will not run. Can this be caused by not having enough pressure between the radiator and heater core?

Check the fuel pressure and the Idle air control valve