This sounds as if you have a wire rubbing somewhere. This can be very difficult to trace without some electrical experience. You will need to isolate the lights from one another to determine where the actual short to ground is. I would locate the parking light wire in the middle of the vehicle that shows power when the parking light switch is turned on, using a digital multimeter. Try not to move the wire look too much as not to disrupt your ability to find the short. Cut the wire isolating the front from the rear. Re-insert the fuse and if it still blows you know it is forward from where you created the isolation. If it ceases to blow then it is aft where you cut the wire. One you determine if the short is forward or aft then isolate the left parking lights from the right. If you have isolated the lights from one another and the fuse still blows then may be in the instrument cluster, parking light switch, etc.
Hope this helps get you going.
SOURCE: 1992 W150. Why do taillight and brakelight fuses keep blowing?
put the numbers on it into google
it will not matter what amp fuse you use it will blow immediately until you fix the reason for the dead short
what you have to check first is the bulbs in use
if you are using a single filament bulb in a duel filament holder , the center contact bridges across the two points in the holder and shorts out the system
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