Location of 30a inline fuse from battery to trailer wiring?

Trying to swap out an old, 6-pole trailer wiring connector for a new 7-pole version.  Everything was
working with the exception of the left turn signal (yellow wire) which was working intermittently.  In trying to
find the reason, I obviously shorted something out.  Now, I have NO lights at the rear of the vehicle or
trailer connector.  I do have headlights, turn signals and flasher working at the front, but nothing at the
rear.  I've pulled a rear light housing to confirm that the bulbs are not blown.  My owner's manual says that
there is a 30a trailer feed wire with an inline fuse, but darned if I can find one.  Can anyone point me to it
so I can check to see if that is what is blown.  I've checked other fuses and they are good.  Thanks in
advance for any pointers or advice.........Ed