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Old 10-23-2007, 11:47 PM   #7 (permalink)
LRCanon
Cummins Nut
 
Join Date: Sep 2006
Location: Baytown, TX
Posts: 438
Quote:
Originally Posted by 076.76cylinder View Post
I have read on different DC forums that the Dodge has a trip in the head light and you will have to add a resistor to some part of the head light system. This is the only part that I don't know about YET. The factory computer checks to make sure it has a load of 35/55 W all the time or something and when you go over to the HID units they pull 55 for one second to light the gas and then they fall off to 10-20 W.. (someone might chime in to what the heck im trying to say,,,, a few beers in me doesn't help my thinking)
You're pretty close here 076.7....the headlamps are actually pulse width modulated from the FCM. You use a capacitor to dampen the pulses to keep the kit running. To explain.....the computer is sending high frequency pulses to the headlights while they are powered up, when the computer does not recieve that pulse back, (after it goes thru the bulb) then it knows there is something wrong and that's how it knows there is a bulb out. You don't see this "flickering" in the stock incandesent bulbs because they don't "cool off" between pulses, but you do with HID's because they are ballast driven. I am currently trying to find out which size capacitor to use for this and will post the info when I figure it out. An up and running HID kit pulls only 35 watts versus the stock bulbs 55 watts, that poses part of the problem with the flickering some run into on HID kits.

at least that's my understanding of it...hope this helps.
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