headlight problems

Make sure they are of the proper wattage. There are two different ratings that i know of and the higher one acted in a similar fashion when i put them in my truck.

 

It sounds like you need a Warning Canceller, also known as a flicker capacitor.

 

I had the exact same issue on mine. Spent a few thousand chasing it. Finally switched to led low beams so I don't need highbeams. What did you figure out?

 

Or first try putting a little bigger fuse 5/10 more amps or possibly just relay

 

I'm having the exact same problem in my 07 379. would love to know what the fix is. If I let my batteries run down to about 12v they work fine until the voltage comes up to about 13.5 and above. Then they seem like they shutting off then come back on. I've been screwig with this all day.

 

Since July of 2005 Class 8 Peterbilt trucks have been equipped with an electronic module that detects and protects against overcurrent and short circuits. Installation of high power (higher current draw) headlamps cases the control module to believe there is a fault. At 12.1V current draw drops below the threshold. But as soon as the alternator starts to charge and voltage raises up to 14.1V then the current draw increases above the threshold again and the device goes into protection mode.


Many LED headlamps operate within the acceptable operating range of the electronics. It is hit and miss depending on how the headlamp manufacturer designed their product. There really is nothing that can be done to the truck to “fix” this issue since it is behaving as designed.

 

I run a projector low beam and matching high beam from Starr. I have 35Watt hid in both. In order for my hids to work properly. I ran a relay for both and use the original low and high power for relay triggers. To make the 9005 bulbs work in the 4 light system. I use a 9007 hid wiring harness and relay on the low beams.

 

This is not entirely true. In 2005, only the instruments were multiplexed, lighting was still old school. Multiplexed lighting started in 2008. Since the year or model of the truck is not provided, we can't really help.

Also since this user only made 2 posts 2 years ago, I doubt that we'll ever know what was done to fix it.