Atleast once a week all dash lights will light up and go off, chimes also. Then my digital speedometer will go blank. When this happens I disconnect the negative terminal and speedometer works again, I don't know what causes this is someone could help I would appreciate it, thanks

 

How is your battery? It might start the truck ok, but when they go weak and start to go out, they make these newer model trucks act crazy. I would start there.

 

The battery is from ford and is about 1year or so new