For one, you are introducing a problem using clamp-on post clamps.
Replace the complete cable(s) with a min 1 GA cable with molded clamp on it. You will have to bend the terminal to fit onto the solenoid stud. Attach ground cable to the block.
If you don't have power to the rest of the car, start at the pos clamp. The smaller gauge wire is a fusible link. Pull on it, if it stretches, it is bad and needs replacement, a length of 14 GA wire will work. Follow the pigtail to a battery junction block, pull off the terminals and wire brush them, reassemble.
Move over to the horn relay and you will find a buss bar with at least two wires, red and orange. Remove them and wire brush them, reassemble. Externally charge the battery and try headlamps again. If lights light, then start engine and check charging voltage across battery posts, should be min 13.8 volts. If no, go to alt BATT stud and measure min 13.8 volts. No volts, disassemble red wire and wire brush terminal, reassemble. Unplug the two wire connector, clean with alcohol and reassemble. If still no charge voltage, check the crimp in the harness between alt and voltage regulator, no broken strands.
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