I have a1994 6.5 diesel blazer new batries(I had the batteries load tested and they read excellent) new alternator I have been noticing my voltage guage reads 9.5 before I start the truck and the starter cranks like it. Immediately after starting the guage goes to 14.5 for a bit and it levels off right at 14 as expected after about 30 seconds. This happens weather the truck has been sitting for 1 min 1 hour or 1 month. I am thinking possible ground issue or possible bad connection at positive starter connection. I'm hoping this a common problem for the volt guage to read low before start and see slow cranking only for the voltage to go back up with the alternator charging. Please save me some time with your knowledge diesel page users.