I have a 2003 ram 4x4 with a factory tow package, I lost my left turn single on my trailer and the auto electric place I took it to said it was a control module under the hood and could only be gotten from the dealer....$500.00 ? Can I get a used one from a scrap yard and where is it under the hood ? Any help would great !!!!

 

my 04 did the same thing last year.

install an after market trailer light setup.. 20 bucks.. and maybe 1/2 hour work.

I did nothing to the fuse box.

if you do a "Search" here.. lots of talk about this issue.
including how to fix/repair the fuse box.