Cadillac Repair: 1989 cadillac seville headlights, cadillac seville, low beams

Question
My low beams keep shutting off after a drive about 4-6 miles, daytime and night. My park lamps stay on and my high beams will stay on, but when i which back to low beams within 4-6 miles they will shut off. I have replaced the headlight switch, the headlight relay, had it tested by a shop and they said there was no shorts anywhere and they couldn't get the lights to shut off at the time.
What else could be the problem, out of answers

Answer
Anthony, it seems like the headlights need to be replaced, or the wiring that goes into the back of the lights is corroded.

This is a common problem and try this test:

After 4-8 miles of driving, bring the car home when the low beam shut off.

Leave the car running.

Pop the hood and jiggle the wiring behind each light, if they suddenly turn on, well, you found the problem

If not, replace the two bulbs.

Good Luck, let me know what happens.

Ron