Hey guys--need a little help.

Been reading for a couple of years and usually find the answer that I need, but this time

I have had trouble pin pointing where my trouble is coming from.

Both trucks and trailers were pretty much idle for the long winter and when last used in the fall had no

problems.

 2 trucks , 2 trailers

Truck "A" will run turn signals and brake lights on trailer "1" but not running lights.

Truck "A" will run running lights on trailer "2" but not turn signals and brake lights.

Truck "B" will run turn signals and brake lights on trailer "2" but not running lights.

Truck "B" will run running lights on trailer "1" but not turn signals and brake lights.

Any help would be appreciated.

RFF

It appears that all your lights work at one time or another.  So it's not bulbs or wiring.

I would start with your plugs on both trucks and trailers.  Clean them good and see if it makes a difference.

http://www.horsetrailerworld.com/home/wiring.asp

Thanks for the help.

Try applying some dielectric grease to the sockets of your trailers' plugs. Insert and remove the plugs into the truck's receptacle several times, and see if this doesn't help improve the connections.

Gard