2010 Peterbilt 387 High Beam Relay Location

[runningman777]

I just got a good chuckle... looking for another headlight answer and I started reading this post and realized it was all too familiar. Oh wait, this was MY post! Lol

About 2 months ago I installed some 60W LED bulbs and new housings. Pretty good improvement and nobody is flashing their brights at me so I'm not blinding anyone.

When I use the turnstalk to flash the headlights to let a passing truck know he can get over, my high beam indicator starts flashing. Seems the system thinks I have a bulb out. The 60W LED bulbs draw less than half the amperage of the halogens.

Tonight I installed 120W LED bulbs and they draw about 20% less that the halogens so I figured they would be a better match. Just looking at the light hitting my garage door I can tell they are somewhat brighter but not a huge change.

The bad news is the high beam indicator is flashing all the time that the low beams are on.

Tomorrow I will check voltages. When I replaced the housings, I installed new harnesses that run from the frame to the individual bulbs as there were just too many repairs to those wires over the years. Who knows what's wrong between there and the module that runs the lights.