I've been told that the entire electrical system runs thru the ignition switch. My Fiat used to cut out everytime I made a left turn. I could make four right turns and the car would be fine.
I gave the car to a FOREIGN CAR mechanic for 5 months, paid him over $400 and when I drove it out, it died when I made a left turn. I finally found a Fiat dealer and when I made an appointment, the telephone receptionist asked what was the problem. I responded and she said: "Oh, it's the ignition switch." And it was! The receptionist was smarter than a foreign car mechanic. $75 later, it ran like a top.
Problem is that the ignition switch is the weakest link in the electrical system. I have a 1981 Spyder w/ 40K miles and have replaced the swith 3 times. It's now dead again.
Good luck w/yours.