Electric problem

[ChevyRay07]

I have a 1985 chevy Scottsdale with a 350 of a 79 suburban
I have no power on my light switch my headlights dash andquarts don't work. All my fuses are fine there all working fine and my starter is having trouble starting up the truck any idea? Starter sounds like it's forcing but won't turn at times

[rich weyand]

Start by replacing both battery cables.  They're cheap, and we have seen a rash of these on the forum go bad internally (and invisibly) over the ten-year mark.