Pickup goes completely dead, while driving, dash goes blank. Fuel pump? on 1990 Chevrolet 1500 Pickup

Have to let it sit 5 to 10 minutes before dashboard comes back to life and it will start right up. Only thing that works while dead, is the interior lights. This was happening once or twice a month, now it is once or twice a week. Have replaced the alternator.

I be leaning toward the ignition switch....
North or south?