has anyone added a headlight modulator to a Fat Bob? I have not been able to find one to fit the dual h13 bulbs.

 

I don`t know if a modulator would be legal on 2 headlights simply because it would mimic an emergency vehicle. Why not just have one headlight modulating.
I use the HD one which only works on the low beam and has a light sensor built in to the switch which is mounted on my left controls.
Also, these don`t work with LED or HID lights.

 

Go to an auto parts store and get an h13 socket
And why won't it work with an LED?

 

Good question. It just said that in the instructions when I put it on 2 years ago. Here is a copy of the instructions. First page, halfway down.

http://www.harley-davidson.com/app-c...ts/-J05530.PDF

 

Interesting, must be the constant cycling burns out the ballast.