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Hey guys ive been struggling with this for awhile, 2005 f250 truck hooked to a haulmark trailer the left blinker and brake light doesnt work on the trailer, the right side is fine and running lights work fine.

I've replaced both Relays 201 and 202, i can hear them clicking just fine.

ive replaced the bulbs and the tail-light assembly on the trailer still doesnt work. Em I missing something here?
 

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It could be a bad ground. Did you check for power at the truck side plug with a test light or volt meter? My 99' truck has a fuse for left and a fuse for the right side trailer signals/ brake lights in a fuse box under the hood by the master cylinder.


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Check fuses. I haven't looked into the 'why' behind it but several times on several different ford trucks I have run into this issue. Always seems to be the left side. Some have fuses for right and left some just have one fuse for trailer lights but even on the one fuse setups the left doesn't work when everything else does...
 
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