HEADLAMP ISSUE

ECM rarely fails. Absolutely the last thing to check. Sensors and wires fail 1000x more often than an ECM.

2019 is still 2 years old. I've seen broken wires on stuff a month old, don't write off the wiring just because.

 

Hello,
I have a 2017 Peterbilt 579
Right side high beam not working
And low beam on left side not working
I also DRL on both side not working. I don’t have fuse description on my fuse, box, can’t really tell which fuse is what. Can anyone help?

 

Check your ground to the lights.
Plugs under radiator have issues.

 

What number is ground on that plug ? Next to the radiator? When I do a voltage on the ground I get -2.34v on both of the lights that are not working on both sides.