About to purchase the underdrive pulley for my RL. Curious if those that have it installed noticed any headlight dimming? Had an underdrive pullet on my Tundra for over 128k miles problem free though I had to upgarde the alternator to a 130amp version as mine was the smaller Tundra unit which caused the lights to dim with the pulley installed. I know the RL has a 130amp alternator also but carried with it many tech gadgets inside.

 

the UR pulley is not recommended only if you are running a system of 600+ watts. With factory stuff and the ur pulley, you should not have any "light dimming" also the RL had HID's, and those aren't dimmable via current.

 

I've had mine on my RL for a long time with no issues at all.