2010 Peterbilt 387 High Beam Relay Location

[runningman777]

On my 2010 Peterbilt 387 I have a dim passenger side high beam. Not critical unless some DOT officer wants to zing me for it.

I replaced the pigtail and bulb, but the problem persists.

Further checking I discovered that the voltage from the wiring harness is low if the bulb is connected. I believe the relay or relay connector is the likely issue, but I cannot locate the headlight relays or fuses. The schematics show the fuses are located on the chassis load center behind the glove box, but the 3 panels located there do not contain any relays pertaining to the headlights.

If I cannot find the relays, I will wire in a temporary relay to supply 12V to the high beam when the high beam wire is activated. I'm sure with the low current draw of a relay coil that I can make this work, but I really need to find those relays.