You can run a jumper wire to T-off from the main running light wire to the side marker light using something like a quick splice connector, # 562.
Or you can use a butt connector, # 05732-2. In one end, place the wire from the trailer connector and in the other end insert the wire from the side marker light and the wire to the tail light. You would need to cut the brown wire at some point to wire it in this manner.
And yet another option is to run the side marker wire all the way back to w view full answer...
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