Cutting into Wire help

I just added some poison Spyder side markers that also work as turn signal. Everything went well put all the wires in the right spot. But not when I put my lights on the driver side parking light is out and the turn signal works. I switched bulbs around to see if that works and no change. It seems like the wire on the harness just died. No power is running through it. Can it be a fuse?

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Could be. I remember Eddie saying that one of the light circuits had a separate fuse for each side.