2002 Tacoma Trailer Wiring Problem

I have a 2002 Tacoma with a factory installed trailer wiring harness.  Here is the problem.  I was trouble shooting a lighting problem on my trailer while it was connected to the Tacoma.  I was using a test light inside of the light housing.  I apparently connected the ground directly to the running lights (Brown wire).  Now I have lost my running lights from the Tacoma.  I continue to have turn signals and brake lights.  Using the same test light, I have determined that the problem is in the Tacoma.  I checked all factory fuses under the hood and in the dash and found no blown fuse.   I did not see any other inline fuses to check. 

Question:  Do I have a fuse problem and just can't find the right one?  or Do I have a more serious wiring problem?

Note:  Everything was working just fine on another trailer prior to my blunder.

Assistance is greatly appreciated.

I discovered three more fuses for my 2002 Tacoma.  They were located behind my back seat. A trailer sales/service group located the fuses and discovered the tail light fuse was blown.  We changed it and every thing is fine.  These fuses come from the lighting converter that is part of the trailering package.

Boose.