I have a 1990 F-150 the headlight will work for about 5 to 10 min. then start to trun on and off. I've checkd all the grounds, installed a new; altenator, high / low beam stwich, and the pull light stwich and had the battery check, all fuses or good. Any suggestionwould be appreciated.
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Yes! After installed, trun key on (engine not running) for 30 mins.,trun off and back on for 10mins., turn off and back on for 10 mins. more; flashing light will go off turn off and try starting engine. Good luck! it's GM's reset for that.