I'm stumped on an electrical problem with my 2002 MCS. When the AC, headlights, and radio are on (when the car is idle), the AC stops for a few seconds and then restarts. When the AC stops, the DSC and TPS lights come on, even though there's nothing wrong with the DSC or tire pressure. Sometimes I lose power steering when this happens as well. I just brought it back from the dealer after 2 weeks to replace the aux fan, fuse box, and engine wiring harness, which the dealer said was the cause. I also had to replace the battery because something was draining it.

I think I've exhausted all resources in researching this issue and I'm wondering if there's something I did not address. I understand that the power steering pump might cause the drain, but could it be that bad that the AC stops and restarts while the engine is on?

Also, after I brought it back from the dealer the PDC stopped working. Could it be programming related or something else?

Thanks in advance for any thoughts.