sobe_zuki

I too have a vibration that comes and goes, but is normally there after about 65mph and up. I put on aftermarket 20" Fuel wheels with Goodyear wrangler duratrac 275/60R20 tires that I have had discount tire rebalance 3 times now to try and rid the vibration. I put those on shortly after buying the truck, along with a 2.5" RC level. I don't recall having a vibration with the factory tires/wheels, but I am going to re-mount them and see if it happens to rule out a wheel balancing issue. The truck only has 7k miles..

This is all I had to do is flip the capacitor harness like you described. It works perfect now. Thanks everyone!

I do have the relay harness, I bought the Sierra spec kit. The capacitor is in-line before the harness. Like I said, it works perfect at night but not during the day with the lower voltage that the DRL provides. I'll re-check the ground for the capacitor.

For those of you with the Morimoto hid kit, what do I have to do with the capacitor/relay harness to make it work duing daytime running mode? I have an SLE and they work perfect at night but they won't come on during the day in auto mode and the relays buzz. I thought I saw what needs to be done but don't feel like reading through all the pages again. Thanks!