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The problem is you have a short in the turn signal system
You have to approach the problem logically. As you stated it is blowing almost immediately after I use it. Is probably wrong it is blowing while you use it .
The first thing to do is see if it is one side or the other or both sides, that is causing it to blow. This Will help narrow down what portion of the system the problem is in.
Post back with the info on what exactly is happening when the fuse blows It is also important if the steering wheel is always make the same movement at the time the fuse blows.
Please include the year make and model of the vehicle
That narrows things down considerably, the short is the fuse box and the turn signal switch.
Your truck uses a specail flasher witch is grounded I would check that first if thats not causing the problem you have to check the wires running from the fuse box to the flasher (2)
the orange and yellow wire is for the turn signals
the red and white wire is for the hazard flashers
Then check the wires coming out of the flasher
one is light blue for the turn sig.
the other is white and red for the flashers
Follow these wires to the plug on the steering colunmthey should have been replaced from there up if they did replace the turnsignal switch
My money is on the flasher, if the short was after the flasher it probably would never flash.
yes the flasher is what I was talking about I didn't realize that it was replaced Knowing this I would say every thing from the fuse box to the turn signal switch is suspect at this time.
there could be a pinched wire inside the column but if it blows when using either direction it is at or before the switch it can't be anything after the switch.
Should you require any more adice just post back or private message me.