If your fuses and bulbs are ok then it's probably the flasher. Its in the power distribution center, under the radio
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Wednesday, January 19th, 2011 AT 6:11 PM
FORD MAN
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115 POSTS
If your fuses, bulbs, & flasher unit are all working correctly. You have a ground issue. All that plastic. Those bulbs need a good-clean solid ground. Check the ground wire on the back-frame of truck, also body to engine ground wires under the hood.