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I have a 1990 250 7.3 L IDI diesel. After driving about 30 miles with the high beam headlights on the headlight switch gets hot and the high beams blink on and off. Has anybody had this problem before?
 

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Need to post this down in the forums below for the older models but on my '80-'86 styles the light switch would go bad and heat up causing issues similar to this.
 

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Headlight harness is your friend. Build one with 2 realys or buy one pre-made. You basically cut the wires from the headlight switch near the headlights and insert a 40amp relay so the power does not go through the headlight switch.
 
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