Car loses all electric and shuts off starts in one to three minutes

Follow the smaller battery positive wire to the under-hood fuse box and be sure that connection is clean and tight. Follow the smaller negative battery wire to the body and be sure that one is tight and not rusty.

The design of the ignition switch makes it a good suspect, but the problems it causes are usually not intermittent. When you can keep it in the bad state, check if you can measure the voltage on both sides of the 80 or 100-amp main fuse in the under-hood fuse box. You should find twelve volts there all the time. If those terminals are inaccessible, measure the voltage on the large output wire on the back of the generator, then on the white/dark green wire in its plug. Both of those must have twelve volts all the time. If those are missing, the best suspect is burned connections on that huge fuse. If those are all okay, we need to take some readings at the ignition switch.