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The most common cause of this is that the fuel pump is drawing to much current due to wear and a possible burned fuel tank connector at the tank. To replace the pump you must raise the truck up and remove the fuel tank. Also replace the fuel filter which is on the inside of the frame on the drivers side. Use a rag to cover the fuel line when disconnecting it with the required special tool.
do you have a tow hitch? if so start at the wiring for the tow package usually corrode and short out the lights. if you don't have tow package harness at the back then i would be looking at the front side marker light wiring, if dash lights are effected it means problem is in the park lights only.
first of all you have to find out what is all on that circuit; I do not recommend you replacing this with a fuse higher then called for!
do you have an amp or after market radio? if you do then disconnect this and see if the fuse doesn't blow
I will bet that you have some type of trailer wiring harness installed. If so, remove it. I have observed this condition many times. It seems that corossion gets into the trailer wiring and shorts out that particular fuse. Hope this helps.