hey guys so I recently bought the blazer and it ran great for a bit but more and more problems arise, so recently the glow plug light would come on but no click but after a few tries would click, but I was deployed to the Mexican border op, and I came back to base and I tried using the glow plugs but the light won’t come on and click, but I have power for my lights and all the lights on the dash, the engine cranks but no full turn over? Could it be that the batteries are low due to me being gone for 3 months?