Would it be beneficial to run the the headlight harness that JBG sells with my led headlights?

 

I doubt there would be any gain in that, the relays are used to take the load off of the headlight switch and wiring, LED are not going to have the same high load the OEM's do..

 

It wouldn't help deliver more power since it's drawing directly off the battery ?

 

Do whatever you want!!!

All I am saying is there will probably not be a noticeable gain in light output like there is with OEM bulbs.

Check the current draw with the LED's and with the OEM bulbs and you will see the difference.

 

LED bulbs by their design require LESS power for the same or brighter light. I see no reason whatsoever to invest in an unneeded relay kit. Unless you like to empty your wallet for no reason.

 

Check voltage drop between battery + and the headlight + lead. A DVOM between the two with the circuit loaded will give you drop.I'd say if it's 1/2v or less there wouldn't be any noticeable gain. If you are losing a couple volts it would probably help.