AC shuts off after only running a few minutes

LongWeekends wrote:
I have a couple of questions...what is the easiest way to determine which of the pigtails are for which unit? Is it just trial and error?

Where do you typically find the corrosion? On the grey wire connector? Black? Both?

Dare I ask if it IS a bad cable, can I simply tie a new one to the old and pull it through or is it part of a big harness?

Finally, any idea what the unused plug that is hanging down is for?

Trial and error on which phone cable is which. easy to do tho. unplug one--if the wall tstat goes dead that is the tstat wire. if not thast wire feeds the middle ac. Now, that plug is the remote sensor plug which you do NOT use. Your wall tstat is the temp sensor for that AC. The Middle and Rear units will have that wire connected to a wall temp sensor. What you have exposed, is exactly where the corrosion usually is. Odds are you have a defective cable cut or shorted. The BLACK phone cables connect to the Circuit board, the gray phone cables go to the Tstat or the middle AC. Doug