Please help !!! I have a 7.3 f450 dump truck and it won't start.... I put key in ignition and turned key to wait for glow plugs to warm up, as I turned key forward the gauges on dash flickered or fluttered a bit I didn't think anything of it and proceeded to start the truck but it only turned over( did not start) . I then turned key back to off position and attempted to let the glow plugs warm up yet again but light did not come on, none of the gauges work , headlights and radio don't work .. Only light on dash that is on is the battery symbol light(red) and when key is in ignition it makes the usual dinging noise.. Tried boosting it thinking maybe batteries were fried.. Still nothing., pull negative from one and boosted the other and still nothing? Any thoughts?