Battery disconect works again

Exterior temp sensor on 2002 appeared to be bad as it showed 50 degrees on 100 degree day, I could only wish. Took off positive cable, cleaned it well, reconnected and presto exterior temp showed 105. First time I tried this I saved 800 smokes by not replacing a radio unit that the cd player wouldnt work.Discoed the battery and cd worked. Thanks to whoever gave this tip on this forum

How long did you leave it off for? do you know where i could fing the complete instructions. I have the same problem with a Bravada.