I have a 2009 Cummings, my voltage light came on. The truck falls on its face at times and the cruise control won't work. I have cleaned battery post, made sure they are tight when I put them back together. Still doing the same thing, I'm going to check all the other connections and see if I find anything there. Do you guys have any advice?

 

Battery posts and grounds are a great start. Check your connection at the fuse box/tipm unit also

 

Thanks for your help

 

I checked all my grounds and positive connections. I changed the alternator and put a 220 amp in. The voltage light is still on and now the lights are flickering.