|     Ok here's my memory of it :
    White - Ground
    Brown - Running lights
    Yellow - left turn/brake
    Green - right turn/brake
    Here's a few websites to look it up on for other trailer options :
    http://www.4wheelnoffroad.com/trailer.html ( has more than four, but the 
colors are correct for the standard 4-way rectangular plug-in)
    http://www.rverscorner.com/wiring/6pole.html ( 6-pole plug horse trailer )
    or you can just go to www.Google.com and use the search engine to look up 
" trailer wiring color code" and it will pull up lots of references to 4-, 
6-, and 7-way plugs. 
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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