No data Link & Speed, RPM, PSI gauges stopped responding & A/C stopped working

possible problem from old qualcomm system or maybe something happen at the datatlink junction blocks

 

Remove the plastic cover from down beside the driver seat along the floor where the data link port is. In the giant bundle of wires under that cover, there'll be a harness with one large gauge wire and four smaller wires. The large gauge wire supplies power to the rear blower in the sleeper. If this connector is all burned up and the connection is bad, it causes the exact condition you describe.

I pulled my hair out trying to find out where the problem was. I knew it was in the bundle of wires beside the seat because when my dash went out, I could wiggle the whole bundle of wires down there and the gauges would come back.

One day when the gauges went out, I reached down and grabbed the bundle of wires to give them a shake and noticed one wire was hot. I stopped and checked out the connector and noticed that when I wiggled that particular connector the gauges would go off and on.

Give that a try and let me know if it solves your problem.

 

Was this issue solved? I’m having the same issue. Gauges and ac stop working at the same time. I hit a bump they come back. Then off and on. Sometimes it would work for a long period of time, sometimes it won’t. Please let know i would greatly appreciate it.

 

Having the same issue, did you solve problem?

 

Bump. I'm having this sporadic issue on my columbia day cab. Thought it was the cluster, went out and borrowed one. It's doing the same. Also the MPH needle shows speed while idling.