I have 98 Chev 1500 4x4. I was trying to crank, would spin over but not crank, kinda like fuel pump bad. But spun over few times then no pwr. Like no battery pwr. Gauges didn't react when key turn to on position. Knew had bad starter also. So replaced starter, found body ground cable from hood to firewall broke and corroded. Replaced. But still no pwr. Checked fuse etc. Under hood.no blown fuses. Tried to find schematics for fuse box under hood but no success. Any tips on where I should start tracing wires etc or what I should check next? Any help greatly appreciated