Originally Posted by ZBass28

I have a similar problem but I do not think its related to wire issue. Here is what happened: (2000 Silverado Z71)

Tow/haul mode was previously working fine. I was using the truck at work to listen to music for a few days while we set up our receiving docks. I made sure to start and use the truck once in a while so the battery wouldn't discharge too much. However, the battery was the original and over 7 years old, so by the end of the 2nd day the truck turned over very slowly. It started, but sputtered right away before the idle evened out. When this happened, I noticed that the tow/haul indicator was lit on the dashboard and pushing the button would not turn it off. I shut off the truck and restarted it. The light was off on the dashboard, but pushing the button would not activate the light or tow/haul mode. Its been that way for the last 2 months now. Did something happen when the battery ran down and the truck barely started to mess up tow/haul mode? Is there a fuse for the switch perhaps?

The battery was replaced the next day, btw.