I got my Squadron Pro and YZ450F harness today for my YZ450FX and cannot figure out where to plug the harness into. I can't find the capacitor under the seat like previously mentioned in this thread (although that was for a 2014 YZ450F and not a 450FX). I tried hooking it right into the coil but the bike died as soon as the light was turned on. I took some pics of the areas I suspect it might be but I'm lost. This is my first time putting lights on a bike.
Your bike doesn't have a capacitor so you'll have to cut the two white plugs off your harness and connect to the battery
directly. I'm not familiar with the FX so I don't know if it's equipped with a dedicated headlight connector or not. If you go straight to the battery I would recommend including an inline fuse. Also it seems Baja Designs
has not updated that harness from previous generations so you'll have to extend it to reach everything.