The old ignition switches were built for 6V. They are one of the largest switches on the truck if not the largest. Built large with large contacts. If it was an original switch, it was "worn out", pitted, corroded, loose, weak contact springs/strips and burnt from sparking 142,350 times. All this blogging about relays and 8ga and the theory of electricity is about an old switch that failed. All opinions, theories and experiences are respected.
Average old switch: 6 starts per day, 365 days per year for 65 years= 142,350. As Jerry says; Your mileage may vary.
